I have a 5 year old irish red and white setter. He has been attacked 5 times by other dogs severely enough to have suffered puncture wounds or require surgery. My husband and I are active and frequently take him hiking and running which puts him in contact with other dogs almost daily. He is well trained and has consistent recall. When approaching another dog he is placed in heel. The dog attacks have occurred by a friend's dog at their home, on leash at a dog class and on leash while either walking or hiking. I am looking for information on dog behavior. Is he presenting himself in a way that makes him susceptible to attack by some dogs? He almost appears uninterested in other dogs especially if running or hiking. Is there anything he or I can learn to minimize attacks in the future?