Eliminate Puppy Biting

To curb puppy nipping and biting behaviors, there's a few things that you can do. For a younger puppy, it's usually effective to give a yelping noise like a littermate might do. For the older puppy, keep some chew toys handy. If your puppy starts to nip, redirect her biting to the chew toy and she'll eventually figure out what's appropriate to put in her mouth. For the especially vigilant nipping pup, give her a sharp "No!" and then ignore her for a while. She may be biting to get attention and will stop if it ceases to become effective.