Hi all, I have an 11 month old working line pup that has been giving me serious attitude since I got him back in April. I do go to an experienced trainer pretty much every Sunday. For the most part he is a pretty good pup, about 90% of the time. But when he sees something he wants to go after and gets worked up (such as the cat, or jumping up and play biting my husband or employee) and I try to correct him he immediately starts snarling, drooling and aggressively going after his leash. I try to grab the leash as close to his collar as I can and hold him off his front legs with my arm out stretched so he can't get to my arm or bite me. He refuses to let go of the leash and starts pulling extremely hard. He gets very serious about this and at some point I am waiting for him to bite me. He has also started getting an aggressive stance with me (stiff body, hair and tail up, growling with bared teeth) when he has a chew toy and I come close to him, or get close to him when he is eating. I do not give in to him and basically just take it away from him and put him in his crate till he settles down. I do engage play sessions with him with a ball or tug and he is good with the out for the most part, and then. I have also used an e-collar on him (advice from the trainer) that worked for the most part, till he decides he doesn't want to deal with that then starts going after the leash again. He is also having bouts of food aggression with me. I do obedience training with him pretty much every day. If I have a ball, or a treat, he is perfect. Without the ball or treat he starts nipping at me. My husband really doesn't do much with him so he treats me way different than he does my husband. My husband is getting tired of him always biting and jumping on him whenever he tries to pet him. I also use a prong collar on him. He is the toughest pup I have ever dealt with. But then again he is my first working line, male pup. My husband said he wants to talk to me about possibly returning him to the breeder if I can't get him under control. Any advice?????