I have a male yellow lab. He is 15weeks, will be 16weeks tomorrow. The only trick he gets is Sit and Come. He understands Down but doesnt always obey. It is getting harder to train him because whenever I go to pet him or praise him he bites my hands instantly. I hold my hand flat in a "stop" position and he usually obeys this but still acts like he is about to bite. I can't control his jumping and training with tricks is hard because he smells them and usually does not want to listen to the command, just leaps for the food, so then I don't give him a treat but he doesnt seem to get it. I am getting frazzled. I have had this pup since the end of November. I know he is teething and that is making him anxious. I do give him frozen washcloths and he seems to like that. Any advice?