The Cavalier King Charles Spaniel of Royalty

The Cavalier King Charles Spaniel was a “spaniel to the kings” being popular with both royalty and nobility alike in the 16th, 17th, and 18th centuries. These are toy spaniels giving them characteristics of both an affectionate companion dog and the instincts of a prey driven hunter. Easy to train and eager to please they are a good choice for first time dog owners. Their dark round eyes and adorable expression will melt the heart at first glance.

Tri-Color Cavalier King Charles Spaniel
Tri-Color Cavalier King Charles Spaniel

The Cavalier is one of the largest dogs in the Toy Breed Group of the American Kennel Club. They stand 12-13 inches tall at the shoulder and weigh 13-18 pounds. In years 2021 and 2023, they ranked number fifteen on the American Kennel Club’s Most Popular Dog Breed List and were the most popular spaniel breed. These gentle, cheerful dogs make wonderful therapy dogs.

History of the Cavalier King Charles Spaniel

This breed dates back to the 16th century and Mary, Queen of Scots. The dog was popular with European nobility during the Renaissance and Mary’s son and grandson Charles I and Charles II of England kept these dogs as well. After the death of Charles II, popularity for these toy spaniels waned and the favored dog of the Tudors, the pug, gained favor. The toy spaniel became almost extinct except at Blenheim Palace where the Duke of Marlborough continued to breed a red and white coloration. However, there was no standard for the type and size of spaniels bred.

In 1920, Roswell Eldridge, an American, began looking for a spaniel that resembled the dogs in the old pictures of royalty. In 1928, a dog was found matching the description and a breed club was formed. The name Cavalier King Charles Spaniel was given to set it apart from the current King Charles Spaniel now known in America as the English Toy Spaniel. The breed was officially recognized by the American Kennel Club in March 1995 making it the AKC’s 140th breed.

Black and Tan Cavalier King Charles Spaniel
Black and Tan Cavalier King Charles Spaniel

Cavalier Hair Care

The Cavalier is a relatively low maintenance breed. They require regular brushing 3-4 times a week and a bath every one to two weeks. Trim the nails once a month or when they make a clicking sound on the floor. As a droopy-eared dog, their ears need to be cleaned on a regular basis. While overall a low shedding dog, they do shed seasonally in the fall and spring and should be brushed more often during these times to keep matting from occurring.

The Cavalier King Charles Spaniel has a medium length coat that is silky to the touch and may be slightly wavy. There is feathering on the ears, chest, legs, feet, and tail. Some owners choose to keep their feet groomed and trimmed down to keep them tidy.

The graceful Cavaliers come in four colors. The most common is the Blenheim, named for the Duke of Marlborough, who kept the breed alive. The Blenheim is chestnut on a white background. The Tricolor exhibits black markings on a white body with tan tips over the eyes, on the cheeks and underside of tail. The Black and Tan coloration is black all over with tan markings and the Ruby is a solid reddish brown.

Exercise Needs

Don’t let that petite frame fool you, the playful Cavalier is athletic and does great at dog sports like flyball, agility, obedience, and rally. Some Cavaliers have even been known to hunt. Although they do well at these types of activities, they are also content with a short walk or even just a romp in the yard. The Cavalier will match their owner’s activity level. Cavaliers can do dog sports or lounge on the couch all day, either works great for them. They don’t do well in heat or cold though. They prefer a moderate temperature.

Blenheim Colored Cavalier King Charles Spaniel
Blenheim Colored Cavalier King Charles Spaniel

Cavalier Temperament

The Cavalier King Charles Spaniel possesses a very even temper. Although they may bark when the doorbell rings, they are quite friendly with strangers. It is said their tails are in constant motion. They are affectionate with children, get along well with other dogs, and adore their people. So much so they do not like to be left alone for long periods of time. This breed is best when they can be home with someone. They are extremely dependent.

While Cavs are easy to train with positive reinforcements and food rewards, they are still easily distracted by their prey drive and if not on a leash may go darting into traffic after a squirrel. Irritating, but not as dangerous, once on the hunt for their prey, they won’t return to your frantic calls. Cavaliers are known to chase birds, rabbits, and other small prey.

Strictly indoor pets, Cavaliers may have trouble with housetraining. If this is the case, a PlexiDor Dog Door is the solution. It is important in potty training to make access available when your dog needs it. With a dog door, the bathroom is available on their terms.

PlexiDor Dog Doors are available in standard and electronic models in white and bronze. Our doors come in sizes ranging from Small to Extra-Large to accommodate dogs from a 6-pound Chihuahua to the largest 220 pound Mastiff. Contact our Customer Service Department with any questions or call 888-PET-DOOR.

Why do cats meow at humans?

Cats in the wild have a wide range of vocal expressions; they hiss, growl, spit, and scream. Cats meow at humans. The regular “meow” a cat gives a human is different, and some cat experts believe the sound developed partly to communicate with people. We associate it with the cry of an infant, and meowing gives results.

Cats are good at varying their meows, and the cat owner learns to distinguish a meow saying “I want to go outside” from a content cuddle meow. Cats can vary the frequency, pitch, volume, tone, and length of their meows, and no two cats sound exactly the same.

If your cat starts meowing obsessively or exhibits other sudden changes in behavior, you need to take him or her to a vet, just to be on the safe side. Other than that, enjoy learning the language of your cat. It’s possible to learn to communicate well with them, and knowing what your furry friend wants opens a new dimension to your relationship.

Why do people look like their dogs?

Most Afghan Hounds will need a Large PlexiDor Dog Door and are thought to look like they have long locks of hair like some people look like their dogs.No matter how much we like dogs, most of us don’t want to look like a dog. There are exceptions, of course, but the vast majority of humans want to look like a human. Still, everyone has seen someone with an uncanny likeness to their dog. Many dog owners even see something of their dog in their own face in the mirror.

It would be easy to dismiss this as one of those things that aren’t real, but when shown a photo lineup of random people and random dogs, test subjects are able to match owners and pets.

It would be easy to dismiss that with people seeking out pets that have something in common with themselves. Maybe men would be more likely to have large dogs and women more likely to have toy breeds, or maybe women with long hair would be more likely to have dogs with long hair and floppy ears?

The ability to match strangers with their pets remain even when these types of characteristics are ruled out.

A Japanese scientist recently set out to solve the mystery. In prior tests he has proven that test subjects can match photos of owners and their dogs by looking at their faces – and see that arbitrarily coupled dogs and people were fake pairs. This time, 502 students were presented with 40 human faces and 40 dog faces.

When shown the entire faces, 80 percent could pick the real life pairs. The interesting thing is that when shown only eyes of humans and dogs, 74 percent could still pick out real life pairs. The scientists ran the test again, and in a second group of test subjects 76 percent could pick out the pairs just looking at the eyes.

Thus far, no one knows how this works, but there is something in the eyes of humans and dogs that can show to complete strangers that they belong together.

Read more here.

2014 kitten names

These gray tabby kittens in a red basket want to know the most popular 2014 kitten namesYesterday we talked about the most popular puppy names during 2014, and today it’s time for 2014 kitten names. The list is compiled by the website

Bella has been the most popular name for female puppies since 2006, and the most popular name for female kittens since 2007. Media absolutely has an effect on how we choose names for our furry friends; Elsa wasn’t even on the top 50 last year, and this year the name of the main character in Frozen sits at number 5.

The number one choice for male kittens has been Oliver for a few years, and Oliver stays in the lead.

Most popular names for girl kittens in 2014:

  1. Bella
  2. Luna
  3. Lucy
  4. Kitty
  5. Elsa
  6. Daisy
  7. Lily
  8. Callie
  9. Lilly
  10. Gracie

Most popular names for boy kittens in 2014:

  1. Oliver
  2. Milo
  3. Leo
  4. Charlie
  5. Max
  6. Simba
  7. Tiger
  8. Smokey
  9. Jack
  10. Kitty

2014 puppy names

Sleeping puppy in a basket with a blanket is dreaming of the most popular 2014 puppy namesEach year, the website compiles a list of most popular names for puppies and kittens. The 2014 puppy names lists were recently released. 

For female puppies, the top three remains constant. Bella is the number one name, and has kept that position since 2006. The first book in the wildly popular Twilight saga was released in 2005 and the heroines name is Bella. That could be a coincidence, or maybe not… The other names in the top three – Daisy and Lucy – have also held their positions for years.

When it comes to the boys, Max has been the number one name for nine years. The second most popular name used to be Buddy, but this name was kicked down to a number four position in 2014. Instead, Charlie and Rocky have filled out the second and third spot.

Top 2014 puppy names for girls are:

  1. Bella
  2. Daisy
  3. Lucy
  4. Sadie
  5. Molly
  6. Lola
  7. Sophie
  8. Zoey
  9. Luna
  10. Chloe

Top names for boy puppies are:

  1. Max
  2. Charlie
  3. Rocky
  4. Buddy
  5. Cooper
  6. Duke
  7. Bear
  8. Zeus
  9. Bentley
  10. Toby

Five of the world’s largest dog breeds

Large dogs are often gentle giants with as much love to give as they are huge. Here are five of the world’s largest dog breeds. 

The Great Dane

This large breed is easy to recognize, and they are known for being friendly, strong, and elegant. They normally get along well with people, other types of pets, and other dogs.

The Dane has roots in ancient history. The earliest known drawings that resemble the breed have been dated to around 3,000 BC, and the oldest written mention to 1,121 BC.

As one of the largest dog breeds, this black and white Great Dane, standing in a field of white flowers, needs an extra large PlexiDor Dog Door

The Irish Wolfhound

On a breed average these are the world’s tallest dogs. When standing on the back legs many Irish Wolfhounds reach seven feet!

This breed is known to be patient, intelligent, and reliable. They love people in general, and do well with children. Many Wolfhounds thrive in the city, but they need a lot of exercise.

These two Irish Wolfhounds, needing an extra large PlexiDor Dog Door, are standing in a harvested field with green trees in the background

The English Mastiff

On a breed average, this is the heaviest dog breed with individuals weighing over 250 pounds. It is also considered England’s oldest breed.

English Mastiffs are known for being on the lazy side and need to be activated to make sure they get the exercise they need to stay healthy. They’re devoted to their family, good with children, and accept other dogs.

An English Mastiff requires an extra large PlexiDor Dog Door

The Scottish Deerhound

The Scottish Deerhound resembles an extremely friendly rough-coated greyhound. They are known for being gentle, loving, and easy to please.

It’s important to know that these Deerhounds require lots of exercise and gets bored easily – if they have too little to do they might take upon themselves to reorganize the home or redesign furniture. They love to have company of another Deerhound.

The Scottish Deerhound laying in a field with yellow flowers requires an extra large PlexiDor dog door

The Leonberger

The Leonberger gets its name from the coat resembling a lion’s mane. Young Leonbergers can be very energetic and don’t settle down until around three years of age, but after that, nothing fazes them.

They’re surprisingly agile for their size, and require lots of exercise to stay happy and healthy.

This Leonberger,dog sitting on grass in a forest requires an extra large PlexiDor dog door.

Dog doors for giant dogs

If you want a dog door for the large breeds, the extra large PlexiDor dog door accommodates dogs up to 220 pounds. It is constructed to take the impact of a big and powerful dog running through at full speed.

The Brazilian people love small dogs

A Chihuahua needs a small or medium PlexiDor dog doorBrazil has undergone large changes during the last few decades, and the quickly urbanizing middle class work more, earn more, and have kids later than previous generations. They also get more and more pets.

The population of Brazil is roughly 200 million people. They also have almost 20 million small dogs, and this is more per capita than anywhere else in the world.

The total number of dogs in the country is around 36 million, and the average home is more likely to have at least one dog than to be dog-less.

Most of these pooches get specialized care – they are blessed by priests, driven in pet taxis, taken for specialized grooming, and bred in dog love motels. The most common breeds are small terriers, shih tzus, and chihuahuas.

The top five countries for small dog ownership are:

  • Brazil
  • Portugal
  • Mexico
  • Philippines
  • USA

The countries with the least small dogs are:

  • India
  • Turkey
  • Indonesia
  • Egypt
  • Saudi Arabia

Egypt only has one small dog for every 5,600 people, and Saudi Arabia one small dog for every 9,400 people.

Myths around dog bite force

Dog bite force myths need to be debunked. Some people who are afraid of dogs will claim that certain dog breeds can exert over 2,000 pounds of pressure with their jaws. It’s an impressive number – and an enormous exaggeration. They bite harder than a human, but not as much harder as one could think.

There are many myths surrounding dog bite force

The average human can bite down with a 120 pound force. A grown up man can reach around 150. It’s not a lot, but being bit by a human will still hurt and do damage.

It is more difficult to measure the exact bite force of dogs, because they won’t bite as hard every time, and they will bite harder if they’re provoked. The force they can chow down with depends on the shape of the jaw and the size of the dog’s head

One test measured three dog breeds that often strike fear in those afraid of dogs; American Pit Bull Terriers, German Shepherds, and Rottweilers. (If you are afraid of dogs, you should know that all dogs can be good and all dogs can be bad – it depends on the owner and not the breed.) The average dog bite force turned out to be 269 pounds of pressure.

The Rottweilers were the strongest and topped with 328 pounds of bite pressure. German Shepherds came in second with a 238 measured dog bite force, and the American Pit Bull Terrier came in third with 235 pounds of pressure.

How does that measure compared to cousins in the wild?

Dogs are at a disadvantage.  A wolf’s normal bite force is around 400 pounds. If it is protecting itself, a large wolf can bite down with over 1,200 pounds of pressure.

Large cats are very strong. A Jaguar can reach 700 pounds of pressure, and Siberian Tiger 950.

You might not think of Hyenas as strong, but even though they are scavengers they also hunt, and most of the time they chase down their own food. A hyena can bite down with 1100 pounds, and they’ve been known to chase off lions to claim food.

When it comes to our primate cousins, the Gorillas are the largest and strongest. An adult male gorilla can weigh 400 pounds, and bite down with a strength of 1,300 pounds per square inch. Now, that doesn’t mean that you should fear gorillas – they are herbivores, peaceful, and shy.

Many who visit the south are afraid of alligators, and it is certainly wise to abide by regulations and warning signs. The American Alligator has a bite strength of 2125, sharp teeth, and powerful muscles to hold their prey. This still pales compared to the Nile Crocodile that can close their mouths with a pressure of 5000 pounds.

While alligators and crocodiles can run fairly quickly on land,  it’s nowhere near what urban myths claim. They can lounge out of water at a fairly high speed, but the land speed record is around 10 mph, and they grow tired quickly when on land. Alligator attacks are extremely rare. The risk of being injured in an unprovoked alligator attack is around one in 2.4 million.

Five energetic dog breeds

When choosing a dog it’s wise to get a breed whose needs fit with the family’s habits. A family that values sofa time above everything else will likely run into trouble with a high energy dog that needs a lot of exercise and mental stimulation, and an active family that’s always on the go might be disappointed if the dog isn’t up to hiking, bike riding, or whatever it might be.

As a rule of thumb, working breeds are energetic, need a lot of activity, and are happiest when they have a job to do. This is particularly true when it comes to the herding breeds, because they’re bred to act individually, to make decisions, and to run non stop day after day.

If you’re considering an energetic breed, think about the following two questions:

  1. Can you handle a dog with endless energy that’s rarely tired or interested in a nap? Many intelligent dogs are also “teenagers” longer than other breeds, which can mean puppy energy in an adult body for years.
  2. Do you want an independent thinker that can draw conclusions – and gets bored quickly?

Here are five of the most energetic dog breeds. They’re all beautiful and make great family friends, but without ample exercise and mental stimulation they will all invent something to do – like remodeling all your furniture or checking what’s behind the wall paper.

5. Jack Russell Terrier

You might not think such a little and charming dog can get into much trouble, but Jack Russells were bred to work and can be very intelligent and active. If left with too much time on his paws, the Jack Russell is likely to find a stimulating task. Like, excavating the garden – these dogs love to dig.

Jack Russell Terrier

4. Dalmatian 

These are wonderful dogs for the right family: loyal, friendly, intelligent, playful, and energetic. The breed originally guarded stables and fire houses, and ran with coaches and horses all day. This required a lot of energy and stamina. Dalmatians require a lot of exercise and continuous mental stimulation.


3. Australian Cattle Dog

These dogs are also known as red heelers or blue heelers, and they’re known for impressive stamina and endurance. They’re amazing if you’re looking for a running buddy, or plan to work or compete with your dog. If you only have time for a short walk each day and the rest of the time will be spent in an apartment, this might not be the best choice.

Australian Cattle Dog

2. Australian Shepherd

While the Australian Cattle Dog is a breed from Australia, the Australian Shepherd comes from the USA and got its name from herding Australian sheep. This is a devoted breed who loves the family, but they’re also really smart and energetic. Like the other dogs in the list, the Aussie does best when there’s plenty to keep him occupied.

Australian Shepherd

1. Border Collie

The Border Collie constantly tops lists with smartest dogs, and this isn’t just because they’re easy to train – they are masters of independent thinking. Match that with explosive energy, and the Border Collie can be a handful for the wrong family. While exercise is great, just running won’t make the Border Collie tired – mental stimulation is required.

Border Collie

Five vocal dog breeds

While there are many dog breeds known for being quiet, such as the Newfoundland, Great Dane, Italian Greyhound, and the Whippet, others have a lot to say. Here are five talkative dog breeds. 


The average Beagle loves to sing along with sirens and bark at real or imagined strangers. Fans of the Beagle singing voice say it’s quite musical, but if your neighbors don’t appreciate being serenaded around the clock you’ll want to make sure your Beagle is active and occupied.


These little cuties are the smallest of the Spitz breeds, but they don’t know they’re small. Pomeranians are active dogs that require attention, exercise, and something to do. They’re too small to bark loudly, but the average Pomeranian barks a lot.


These small, sassy dogs can be quite protective. Many neglect to train them because they’re so small – what harm could they possibly do – but all dog breeds require training and socialization. Lack of training often leads to never-ending barking and bad behavior. Spend some time training and playing with your Chihuahua from a tender age and you’ll get a great dog.

Basset Hound

The average Basset Hound is good natured and friendly. Most Basset Hounds aren’t as active as other hounds, but they’re still quite good at howling. It’s usually not a problem if the dogs are allowed to be with the family, but a Basset Hound abandoned in the back yard is likely to share his feelings with the rest of the neighborhood.

Alaskan Malamute

These dogs are cheerful, friendly, large, and strong. If you’re considering adding a Malamute to the family, be aware that these dogs are bred for hauling heavy loads long distances in the most inhospitable climate imaginable. In other words, the average Malamute needs something to do. They’re experts at climbing and digging.

Few Alaskan Malamutes bark excessively, but they often howl along with sirens and like to talk to you with a “woo-woo,” sometimes imitating the intonation of human words.


Alaskan Malamute

The beautiful Alaskan Malamute has been known to sing along with sirens

Fun facts about dogs

Love dogs? Here are some fun facts about dogs you might not know.

Ever wonder why you can’t outrun your dog even on the best of days? The average dog can run around 19 mph. The Greyhound is generally considered the fastest dog breed, and they can reach speeds of 45 mph over shorter distances. When it comes to long-distance running, the Saluki is the fastest. They “only” run 43 mph, but they can keep that up for miles.

Smaller, but super-quick, the Whippet is also amongst the top speeding dogs. A Whippet can run 200 yards in 12 seconds.

The Border Collie might not be a breed many associate with speed, but they have physical abilities to match the role of super-smart workaholic. These dogs can make hairpin turns, keep control and speed while throwing themselves into a new direction, and keep a pace of 30 mph. A herding Border Collie can easily run 50 miles in a day.

Dogs aren’t just fast when it comes to running – an average dog can locate the source of a sound in 6/100ths of a second. They also hear a larger range of frequencies than a human, and are estimated to hear about four times better than humans. Many dogs dislike loud noises – if it’s loud to us, it’s really loud to them.

Many dog owners claim their dogs speak to them. Dogs can indeed show emotions through their face, and have around 100 different facial expressions to accompany a long row of different vocal sounds.

Border Collie

Five interesting cat facts

Singapura is the world's smallest cat breed.Cats are great companions, but their behavior can be puzzling. For example, why do they love cardboard boxes so much?

In the wild, cats like to claim locations as their own, and they like to be in enclosed spaces. This is what we see today when a cat climbs into a narrow cardboard box.

Computer keyboards also hold a special allure to cats. It is a thing to claim as theirs, laptop keyboards are often warm and comfy, and humans touch keyboards all the time, which makes them special.

And why do cats always climb on the one person allergic to them?

Many cats gravitate towards people who are allergic or don’t like cats. This seems counterproductive, but cats play it safe and often choose to approach people who aren’t trying to get their attention. When a cat doesn’t know a human, gestures and calls can feel like pressure to perform, or even seem threatening. A person who doesn’t want a cat on their lap can be interpreted as safer.

Why do cats drink out of glasses or even the sink instead of the water bowl?

This too comes from their behavior in nature. Cats will avoid drinking from a water source close to something dead, because the water can be contaminated. This instinct remains. They will choose water as far away from their store-bought food as possible, to make sure it’s clean and healthy. Put the water bowl in another corner than the food bowl, and kitty will probably like it better.

Why do some dogs love to have their tummies rubbed?

Some types of doggie behavior can be puzzling to us humans. Like, what’s up with the tummy rub? And why are dogs so fascinated with sniffing each other’s butts? 

The belly scratch

Not all dogs like to have their bellies rubbed, but many of those who do really cherish it. There are several theories to why.

Dogs generally don’t show their stomach to other dogs – unless in a sign of submission – and assuming they don’t do it of fear, showing their tummies to us shows trust. The tummy rub becomes a way of bonding.

On top of this, the stomach can be difficult to reach with the paws, and the skin there is sensitive. A good tummy rub with human fingers probably feels better than their own nails.

The butt smelling

If a human was to approach from behind and smell another person’s butt we’d find it peculiar to say the least. In the doggie world, this approach avoids challenging someone by facing them head-on. The tail-end of the dog also gives off pheromones that can be read by other dogs. By sniffing the behind, a dog can learn about sex, reproductive, and social status.


Five fun trivia-facts about dogs you don’t know

Most people know something about dogs, and if you have found your way to the PlexiDor page you probably know a lot about them. Besides being good company, they make excellent conversation starters. Here are five fun trivia-facts about dogs you might not know.

5. New Zealand town has buildings shaped as sheep and dogs

Tirau is a small town on New Zealand’s north island. The town was traditionally a farming community, but has started to make money as a tourist attraction. They have a tradition of using old, discarded, corrugated iron to create art, and they have a craft store shaped as a sheep along with an information center shaped like a dog.

Sheep and dog building, image from strange buildings.
Sheep and dog building, image from strange buildings.

4. Who cleans up after a seeing eye dog?

These dogs are highly trained professionals. They guide their handler through complex environments, traffic, and more. They only do their business on command, and the males are taught not to lift their leg when peeing. This makes it possible for a handler to pet the dog once it’s doing its stuff and figure out what’s going on. If the dog’s back is rounded, cleanup will be required.

3. Seeing eye dog was first dog to become a “Million Miler”

Speaking of seeing eye dogs, service dogs are allowed everywhere open to the public. That includes planes. Nesbit was a seeing eye dog who earned over one million Delta airline miles in his life. He even had his own frequent flier card.

2. Stray dogs in Afghanistan saved 50 soldiers

The troops made friends with a few stray dogs, and when a suicide bomber tried to enter the soldiers’ quarters to kill the 50 men inside, the dogs attacked. One of the dogs was killed in the incident, but the others were celebrated as heroes. It turned out to be pretty expensive and difficult to bring the dogs to the US, so a Facebook group raised $21,000 to fly the dogs to America.

1. The average dog knows math

Most dog owners think their pooches are smart, but few people know exactly how smart. One Border Collie understands a vocabulary of over 1,000 words, and has shown a grasp of grammar. The average dog can understand up to 250 words and gestures, can count at least up to five, and perform simple mathematical calculations.

Bonus trivia: 

While pet “holes” have existed almost as long as cats and dogs have accompanied humans, Sir Isaac Newton is credited with inventing the modern pet door.

Dog breeds with best sense of smell

The Beagle is amongst the dogs with best sense of smell.

A dog’s sense of smell far surpasses a human’s. But, have you ever wondered which breeds have the best sense of smell? Here is the top five breeds for detecting scents:

1. Most people would probably answer Bloodhound, famous from many movies and cartoons where they track scents for miles. A Bloodhound has 300 million scent receptors, which is far more than any other breed. These dogs can follow a scent on the ground, and also air scent. This is one of the oldest breeds that hunt by scent, and Bloodhounds are indeed used by law enforcement. Their work is so accurate that evidence trailed by Bloodhunds has been accepted in courts.

2. The Basset Hound is often considered the second best in scenting ability. These dogs are built to follow a scent trail, and have a phenomenal sense of smell.

3. The Beagle comes in as favorite on many types of dog breed lists, and they also have an excellent nose. These cheerful little dogs have as many scent receptors as the much larger German Shepherds, and can follow both air and ground scents. Beagles are often used as detector dogs for narcotics and agriculture. The USDA Beagles have a 90 percent success rate and can recognize around 50 distinct odors.

4. German Shepherds might not be the first breed that comes to mind when discussing sense of smell; they’re more known as police and military dogs. However, their keen sense of smell is one of the properties making them so well suited for these lines of work. They have around 225 million scent receptors and are excellent at air-scenting. That means that a German Shepherd can track a human scent carried by the wind. They are often used as tireless Search and Rescue dogs, bomb detectors, and narcotics trackers.

5. Labrador Retrievers also come to mind when talking about working dogs. Their sensitive noses made them great for Search and Rescue, drug, and bomb detection. Labradors are sometimes trained to detect cancer from a patient’s breath.