Well first off let me start by saying I have been a lazy idiot. I have an 8 year old german sheperd which has almost no training. He is house broken and knows the sit command that's it. Recently I've been trying to train him to respond to other commands (stay, come, lay down). The problem is he gets aggressive with anything he doesn't like including giving him treats. How can I train him not too snarl or growl when giving him a treat or ever? The larger question I guess is can I train him without using treats.