How to Stop Puppy Mouthing and Biting
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"One common question from new dog parents is how to stop puppy mouthing, nipping and biting. Puppies, being like a human newborn, explore with their mouth and will engage in play biting along with nipping the pet parent's ankles, arms and hands. The problem is when the sharp puppy teeth break the skin when interacting with everyone that wants to touch the new pup. This form of "play aggression" is often a bit over the top without any inhibition. If the behavior is not corrected when young it can turn into something more dangerous as the dog gets larger.
Teaching methods using games are a great way to reinforce bite inhibition. The use of positive (treats) and negative (stopping game time, moving away) are both ways to eliminate puppy biting and nipping behavior. In general, to prevent puppy mouthing do not encourage a puppy to play with arms and hands and be sure to never hit your pup when training."