Shadow is driving my wife and i nuts! He bites us like crazy. I know he is a puppy but he prefers to bite us instead of his toys which we try to play with him with. We throw a toy and he brings it back and bites, or he pays no attention to the toy and just bites! If we tell him no he starts barking at us! What am i doing wrong? We teach him obedience commands. Most the time he will sit and lay down on command. He is being taken to puppy classes (we've only been to one since last week was a blizzard) and his second class is tomorrow. Any suggestions?