Is it Only when dogs get in his face on leash, or does he try and actually "go after" them? Riley too does Not like other dogs that get in his face. He is perfect off leash, likes other dogs, etc. When they get pushy and in his face *on leash* he will tell them off. Riley likes all other dogs to have the same wonderful manners that he has. I dont see it as aggression, and i know he would never actually bite anyone. He snarls and makes a face, which in dog language i find perfectly acceptable for him to do. I dont like people in my bubble either that are pushy. As long as you can control him, and he is not doing this behavior "unprovoked" then i would not worry. Dogs have a right to let another dog know they dont like it.