Is a dogs mouth completely sanitary?

No, a dog's mouth is not completely sanitary. While dogs do have a natural antibacterial saliva that helps to keep their mouths clean, their mouths are still home to a variety of bacteria. Some of these bacteria are harmful to humans and can cause infections such as salmonella, E. coli, and rabies. It is important to avoid contact with a dog's mouth and to wash your hands thoroughly if you do come into contact with it.