To discourage my dog from nipping, our family got into the habit of purposefully touching our dogs teeth during affectionate moments then saying "Owwie!", then immediately everyone would frown and stop playing until he looked scornful.
From there the fun could again continue. Another part was hand feeding kibble. If his teeth bit to aggressively, the food was denied, "Owwie!". This second part is also good to teach "Easy".
It took my dog a short while to understand that his teeth could hurt a person but took much longer learning not to chew our stuff.
Dec 06, 2009 Rating
puppy biting tips by: Debbie
I would also suggest you encourage some of that energy to be used up during play sessions since puppies have loads of energy and if a puppy has no way to vent that energy it often ends up in some sort of undesirable event such as you've just named, digging, etc. After all, a tired puppy is a happy puppy.
Plus, here are some more tips for puppy biting, hope they help:
Since you are already in training, which I am very happy to hear, I would bring up these issues with your dog trainer and discuss possible training options with him/her.
I'm sure your puppy trainer can offer tips on how to stop the nipping or at least how to discourage it and possibly move all that biting energy into something more productive. Good luck