I ran across this FREE E-Book on how to break up dog fights. Now not that Gordon Setter owners have to worry about this a lot, but it's good information to know and it's FREE.
Ed Frawley is the owner and trainer at Leerburg Kennel in Menomonie, WI. He has been a trainer and dog breeder for 45 years. He mainly breeds working German Shepards.
NOTE: I have never met Mr. Frawley, and I am not affiliated with him or his kennel, what so ever. I simply ran across the website and really liked his way of thinking. At least what I have seen.
My attitude is, you learn everything you can, then apply it to your own situation and needs.