| MadSci Network: Zoology |
Whenever you wonder where does something come from, in regards to an animals physical features, just ask yourself, How does this thing benefit the animal? Think about where the animal came from originally, if it is a domesticated animal like the dog. When dogs roamed the earth as wild animals, they probably did a lot of traveling on hard ground. Their feet are therefore hard so they could handle this without getting sore feet.
Try the links in the MadSci Library for more information on Zoology.