Hi i'm a new member and i own a bull terrier and a jack russel terrier. Any ways my jrt is really friendly and so is my BT but for some reason my BT hates other dogs. Just recently i took my BT to the park and my friend brang his chocalate lab and wow, they were fine for like 5 minutes then they just went at it, of course my Bull terrier won with ease and really hurt my friend's dog but how do I prevent this from happening again