When you play with your puppy, let him mouth on your hands. Continue play until he bites especially hard. When he does, immediately give a high-pitched yelp, as if you're hurt, and let your hand go limp. This should startle your puppy and cause him to stop mouthing you, at least momentarily.
Why is my puppy going crazy and biting?
Nearly all nipping is your puppy's way of getting your attention and trying to engage you in play. If you ever watch puppies or dogs play, you'll notice that most of them naturally “play fight.” They chase, tackle, wrestle, and chew on each other.
Should you pop a puppy for biting?
Don't resort to physical punishment. Physical punishment should never be a course of action following a puppy or dog bite. Tapping or popping them on the nose can be misunderstood and seen as being playful. This could also encourage more unwanted biting behavior.
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