A: You will not find belly buttons on animals like birds and reptiles, but you will find them on most, but not all, mammals. Only placental mammals will have belly buttons. Marsupials, such as kangaroos, koalas and opossums, give birth to relatively underdeveloped young. Keeping this in consideration, are humans the only species with belly buttons?
So, yes, dogs (and cats) have belly buttons — they just look different than human belly buttons. In fact, humans are the ones with the unusual belly buttons. They're relatively large compared to those of other mammals.
Similarly, do echidnas have belly buttons? Echidna and platypus are egg laying mammals and so do not possess belly buttons. While marsupials do carry their young in the womb they do not feed their young through an umbilical cord like most mammals do.
Also question is, why do humans have belly buttons but animals don t?
While mammals do have belly buttons, they're a little harder to find. Since mammals are gestated inside their mothers, they are all born with umbilical cords. When they emerge, the mother chews off the cord with her teeth, leaving a flat scar that is less noticeable than a human's navel.
Do dogs have belly buttons that stick out?
Dogs have belly buttons because they're placental mammals. When puppies are developing inside their mother's womb the nutrients and oxygen they need are passed from mother to baby via the umbilical cord. The belly button itself is just the scar leftover from where the umbilical cord was removed after birth.
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