I just two weeks ago adopted a 6 month old Pittbull Lab mix boy pup named Rosco. I adopted him from a young couple who had only had him out of the kennel about four hours a day since the day he came home.. He is a very sweet boy who loves to snuggle. and lots of energy (as expected). He has learned all the basic tricks and potty training within the past two weeks. We go on two walks a day and have lots of play time. Though Rosco sometimes gets a little nippy. He is not responding to "No" at all when biting. He will charge and bite my legs ( tail still wagging) when I remove myself from his area when he refuses to stop biting. I have tried all kinds of different tactics, I've read over books, forums and everything in the book to get him to stop but he refuses to listen. I love this boy and I want to solve this problem, I have young children I plan on introducing him to.. But the weight on his bite can be very painful and sometimes intimidating when unable to gain control of him. Does anyone know what I should do?