Toby and Wally just LOVE those chicken strips! Wally is really good about them, but Toby acts like a mad dog when he sees me take them out. He never growls at me, but if Wally gets too close to him, he snaps at him. I put a stop to that by making Toby "work" for each piece of chicken he gets. For example, he must sit, lay down and roll over before he gets a piece. I give the sit command only once and if he doesn't do it, I move on to Wally. It has really helped calm him down when it comes to the treats. Maybe you could try something like that with Tyler.