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Some are barely noticeable while others are quite prominent. Do all mammals have belly buttons. Why Do Dogs Have Belly Buttons Dogs Mammals Animals Since they are mammals they definitely do. . When they emerge the mother eats the cord with her teeth producing a flat scar less visible than a humans navel. Since mammals are gestated inside their mothers they are all born with umbilical cords. It may be due to their diet exercise habits or simply how their bodies are built. Most animals belly buttons are not as distinct as ours more of a little white scar. Whether you have an innie or an outie pretty much all of us mammals have a belly button. When they emerge the mother chews. But before you had a belly button there was actually a different bit of anatomy in its place. Its just placental mammals who happen to have belly buttons. Does a frog have a belly button. Why this is varies from dog to dog. Marsupials are not placental...