The cat family is one group of mammals that can retract their claws, or pull them inside the foot. Most mammals have claws that are not retractable, like a dog. Claws are useful to mammals in a number of ways. They can be used for both defense as well as in capturing prey. Sharp claws can help a predator hold on to its prey as well as deter other animals from taking its meal.
Mammals also rely on claws to help with climbing and burrowing.
Claws can help an animal scurry up a tree away from a predator. They can also help a mammal to dig deep below the earth in order to create a burrow for young, or an elaborate tunnel system for an entire family group, as in prairie dogs. Hooves Like claws, hooves are also made of keratin and are found on mammals such as pigs, deer, antelope, and horses. Hooves are usually found on herbivores or prey animals. They serve a very special purpose for most members of this group by offering protection from the impact of their feet striking the ground when running.