pugs are popular and often liked most for their curly tails, compact body, a deep chest, and strong muscles. there are two different types of a pug's ears, "rose" and "button". "rose" ears are smaller than the "button" ears and are folded up instead of on the side of the head. most people prefer "button" style pugs. pugs have strong, straight legs and laid back shoulders. their feet are not as large as a hare's foot, but they are not as round as that of a cat, either. they have toes that are split up perfectly, and their nails are all black. the lower teeth normally grow farther out than the upper teeth, so they meet in an under-bite.