Nipples are raised areas on the surface of mammary tissue in mammalian species.Ī nipple allows milk to flow from the deeper mammary tissues of female mammals. Jess will explain dog nipple basics below: What Are Nipples? How Do They Work? You may not be comfortable asking your local vet about your dog’s nipples, so this article is here to answer some of the more common questions that vets get about this silly canine topic.ĭr. How many nipples do dogs have? What a funny question! It’s a question that veterinarians get a lot.