The Boxer is a fairly large breed and will need a PlexiDor Large to be comfortable. This door accommodates dogs up to 100 pounds, and the Boxers usually weigh around 66 to 70 pounds.
The large PlexiDor dog door has an opening size of 11 3/4″ x 16″ and the door is usually mounted eight to ten inches off the floor. If you’re uncertain of the size, cut a hole in a piece of cardboard and see if your dog seems comfortable going through.
The top of the opening should be just above your dog’s back – they will lift their feet as they go through, and bend their head to push the door open.
Other breeds that need a large door include Collies, Labradors, Setters, German Shepherds, Dobermans, and Golden Retrievers.