Boot Blacklick, OH 10/1/2012 6:53:10 PM So our puppy is 10 weeks old and does the same thing. He is extremely smart - potty trained at 8 weeks, knows the basic command of sit, stay and down. But, he will go from playing to biting hands, feets or grabbing onto a pant leg. My son and daughter told me the next time he does that to just yelp loudly and he would stop, because he doesn't want to hurt me. I tried it tonight and it startled him. So far, it's worked. It's worth a try.