I have run vest on some really rough bay dogs before and with out a doubt some of them lived to see another day because they were wearing vest and cut collars. Keep in mind that most bay dogs do not need vest, they will usually figure it out after they get on a few rough hogs and learn to stay back. If they continue to catch on the large rough hogs, then a vest and collar might not be a bad investment. Baydog.com can provide you with information as to where you can purchase vest and collars if needed. They make some running vest specifically for bay dogs. If you have access to a bay pen, put your dogs in there and see how rough they tend to be. Don't put all three in at once because they tend to be a litttle braver if they have back up, start out with a small hog if they catch put a larger one in the pen with them. After a couple times in the bay pen, you'll know if a vest and collars are a good investment. Good looking dogs.........Good Luck!