Yes , in class he was on a leash. The trainer alerted me that he was having "conversations" with other dogs and I was to get in front of him to break his gaze. There was a lot of "talk" from our trainer in the class and we were expected to pratice at home which I did and he was always ready for the next class the following week. Yes I have used the "come command" and usually worked with treats, but today he would not come if I was holding a T-bone...it was a dog with a focus and it was the poor student! I know he is territorial and jealous , this event in the soccer field has happened twice before with people who were cool with dogs. This is not going to be the case every time. Is it possible he will always be a dog on leash? He needs to run and chase his ball but I can't do this if I don't trust him to respond to me.