We adopted Annie from the shelter ten days ago and she's coming along very well. She was picked up as a stray and she is somewhere under two years old because she still exhibits a lot of puppy behavior. She may only be a year or 18 months old, we can't be sure. Anyway, she's doing well with potty training, she understands our invisible fence (1.7 acre yard) perfectly, and has few bad habits. However, in her puppy playfulness she has a strong urge to nip and mouth with her teeth. It can hurt, and she even accidentally broke skin on my knuckle. What is the best way to teach her that teeth are not for human play? It's almost like the nipping you see in puppies, but at 54 pounds she's much too big for that kind of behavior now. Thanks for any suggestions. Holding her mouth closed and blowing on her nose worked for my previous dog, but she doesn't seem to get what that means.