Amongst 650 military dogs deployed with American combat forces nearly five percent came down with symptoms of Post Traumatic Stress Disorder. These dogs have been subjected to gunfire, explosions, and other combat scenarios, and react just like humans do.
Military veterinarians say it can show through dogs becoming clingy or aggressive, they might refuse to enter areas where they used to be comfortable, or become hyper-vigilent and set off alarms whether there’s something to worry about or not.
Dogs affected should be taken off their patrol duty, given lots of exercise, play time, and gentle obedience training.
Another similarity with humans is that dogs don’t have to go to war to enter a state of extreme stress. Other causes for PTSD in both species are natural disasters, car accidents, and physical or emotional trauma.
If you want to read more about dogs with PTSD, these websites provide a good starting point: