Here's a post I wrote a while ago for another list on how to get a puppy to stop biting. I've used it on all of my dogs and it hasn't inhibited their bite.
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I believe that if you communicate with your dog or puppy as another dog does, you will achieve much greater success in a shorter period of time than with any other method.
Part of normal puppy behavior is rough and tumble play involving mouthing and biting its littermates as well as its mother and father. When you bring a puppy home he will play with you the same way. Since your skin is much more delicate than that of a dog, this will hurt. This is especially true since a puppy's teeth are like little needles. They cause pain because they are so sharp and can, on occasion, puncture the skin.
In my experience, yelling in pain may stop the dog, but rarely works more than a few times. I think the puppy is startled by the sharp loud noise and inhibited for a moment. But after a few times of this occurring, the puppy learns that nothing bad or uncomfortable happens and he learns to ignore it.
I believe that the best way to stop a puppy from biting too hard is the way his mother does.
When a puppy is nursing and bites down too hard on his mother's nipple, she will take his whole head in her mouth and bite down, slowly increasing the pressure until the puppy goes limp, exhibiting submission. She will hold that pressure for a moment and then releases it. After a few repetitions of this, the puppy becomes conditioned to the amount of pressure that is appropriate. He learns that a little pressure is O.K. but that a harder bite brings an unpleasant situation.
No, I don't want you to take your puppy's head in your mouth. The puppy's head is probably be too large for that, and besides, there’s all that puppy hair on your tongue.
Feeding a piece of food, is excellent for starting the "off" or "leave it" command but that method will take a couple of weeks of training before you can expect the puppy not to bite. I don't have a couple of weeks to train my puppies and they can cause a lot of pain and do a lot of damage in that time.
I advocate that when you are playing with your puppy and he bites too hard, you should immediately engulf his head with one of your hands. Slowly increase the pressure of your hand, squeezing HIS lips into HIS teeth until he stop moving and becomes passive. Hold that level of pressure for just a few seconds and then release the puppy.
Don't yell, unless it's involuntarily as a result of the pain from the puppy's bite. Don't scold, don't shake the puppy. His mother does not do any of these things and she manages to get him to stop biting too hard in short order.
I have never had to do this more than five or six times before the puppy learns what is and what is not, an appropriate level of force when playing. It is usually done in one afternoon with a reminder or two the following day.
Some of the readers of this may say that it is cruel or may cause the puppy to bite even harder or that it will cause hard feelings between the puppy and the owner. I will counter that it doesn't do any of those things when the puppy's mother does it and it won't with you.
Lou Castle has been kicked off this board. He is an OLD SCHOOL DOG TRAINER with little to offer.