It really depends on the animal. Some animals' feet are simply called feet. However, some of them have specific names. For some, like the dog, the feet are called paws. For some, like the cow, the feet are called hooves.
Gnawing animals are rodents.RAbbits, shrews, moles, capybara, hares, beaver, agouti, mara, gerbils, hamsters, guinea pigs, porcupines, chipmunks, ...They are chracterized by long front incisor teeth...