Just like human males, male dogs have two testicles. You can look to see if your dog as two testicles, provided the dog is old enough. You cannot check a male dog's testicles if the dog is under seven weeks old because the testicles have not descended yet, according to the Shelter Medicine for Veterinarians and Staff guidebook. Learning how to check if a dog has two testicles can help you figure out if your dog is a male or a female.
Position your dog on its side, and then rub its belly to relax the dog.
Spread your dog's hind legs while holding the dog down. This may require another pair of hands.
Look at the area below the dog's stomach but above the anus. The two testicles will be located here.