When I tell my 15 week old Golden Retriever puppy to stop doing something firmly (mostly biting me) He becomes extremely angry with me, snarls -barks - and then snaps at any body part of mine. I immediately let him know from day one that this is very unacceptable behavior. I got him when he was a little over 8 weeks old from a reputable breeder. I did a lot of research prior to getting him; I've read around 25 books on puppies/Goldens - Ive seen almost every episode of The Dog Whisperer (as well as have read all of Cesars books) . My puppy is also in obedience class where he excels in following other commands (sit, down, leave it, come) ... I understand that he is teething of course (and he has PLENTY of the best chew toys Kongs, etc...to play and chew on) but I do not understand where this aggression comes from when bad behavior is being corrected. He bites me to the point of where I am bleeding all the time. I also want to make note that he is exercised multiple times a day - and rests well too. When I correct his behavior I tell him "WRONG" Sternly - and often have to grab the back of his neck to pull him off of me. I will also push down on his tongue sometimes if it gets really bad . Now, because he has become so angry with me ; I have to pick him up and put him in his playpen. I cannot ignore or turn around or he bites the back of my legs very hard. I just feel so sad , because I am trying to do everything right, give him lots of love, attention , and raise him to be a good dog. Has anyone experienced this? What am I doing wrong? I cant seem to see the light at the end of the tunnel , and its really starting to make me so so discouraged.