Cats don’t have teeth as we do; instead, their mouths contain sharp-edged fangs called carnassials. They use them to tear into prey animals such as birds and rodents. Cats also have claws on all four feet, which help them climb trees and other vertical surfaces. Dogs lack these features. Instead, they rely on their powerful jaws to rip apart meaty bones. While both canines and felines require protein sources when eating, each species has different nutritional requirements.