What you are doing is reinforcing a behavior they are already familiar with, because their littermates did the same thing when their playtime got too rough. Your goal is to help them to make the association the force of their bite, determines the length of human playtime too.
Even though this method works at any age, it is most effective when the puppy is under 12 weeks old.
That’s because puppies can more easily associate it to their playtime with their littermates, and their jaws have not developed to where the pressure of a bite is painful!
The first thing you must do is to let your puppy know they are hurting you, in a way they can relate to from that experience. Rather than reprimanding, removing, or restraining your pup, it is usually more effective to let them immediately know they have hurt you by giving a voluble yelp or cry “OUCH.”
Usually, they will back off.
Next, give your pup a minute or two to process what has just happened. Then call the dog back to you. The puppy must earn your pardon by following a simple command such as “sit.”
When they try to “make-up” with you, by licking, acting submissive or trying to resume playing, allow them to show they are sorry.
Then resume playing.
Use appropriate discipline
If your puppy does not back off when you yelp, or cry “OUCH,” or returns to playing too hard, stand up, firmly say “ENOUGH,” leave the room, and close the door behind you.
When you are outside, firmly say “ENOUGH,” and walk away.
If possible, go inside, leave your pup outside for a minute or two, so they can make the association when they hurt you, they have no one to play with. Return and call the dog back to you.
Again, they must earn your pardon by following a simple command such as “sit.”
When they try to “make-up” with you, by licking, acting submissive or trying to resume playing, allow them to show they are sorry; then continue playing.
Be fair, firm, and consistent. Eventually, your puppy will associate the force of their bite, which determines the number of interruptions in playtime.
Karen A. Soukiasian is the owner of Good Dog! — Dog Training in St. Augustine, Florida. You can follow Karen on Facebook.