Inc. A puppy likes biting and chewing on almost anything that enters her world. Just as with jumping, biting between littermates is their style of play. Biting also teaches them how to use their main hunting tool, their mouth with all those teeth, later in life. Unfortunately, this often carries over into their interactions with the members of their new home. All the people, including the children, are brought into the game.
Puppies have very sharp teeth and a bite or nip can hurt and be terrifying to small children.
There are several methods that are used to eliminate this behavior. This is usually done by having your thumb over the top of their nose and your fingers below the bottom of the jaw. We hold their mouths closed for a few seconds. They will whine as this is uncomfortable and they don't like it. There is no need to firmly squeeze the upper and lower jaws together.