Yes! Microbiologist Dr. Charles Gerba says dog and human mouths contain different types of bacteria. And what’s in a dog’s mouth can cause gum disease in you, or salmonella poisoning. Face it – we love our dogs but, as Dr. Gerba puts it, “They use their tongue for toilet paper.” So keep dog slobber away from your mouth. Besides, dogs don’t have the enzymes to process dairy – so ice cream will give Rover the runs.