Biting is a natural puppy behavior. Puppies explore their world with their mouths, and they use their teeth extensively in play. Learning bite inhibition is an important part of a young puppy’s education. If he bites his mom or his littermates too hard, they let him know. Mom may reprimand him roundly if his needle sharp puppy teeth close too hard during nursing, and his siblings may yipe and refuse to play with him if he bites too hard. One of the pitfalls of taking a puppy away from his littermates too soon is that he misses out on this important lesson. Pups should stay together with their litters and their moms until they are at least eight weeks of age.