"... aggression [towards dogs] is fear..." Surely, you jest... A Pit Bulldog (or an American Bulldog, for that matter) does not fight out of fear, my friend. American Bulldogs have been used in Southern Louisiana as well as Catahoulas and Pit Bulldogs (used at times to cross into the other two to increase drive) as farm dogs and catch dogs for both domestic and feral pigs and in some Southern states for boar hunting. Bear hunting catchdogs and kill dogs for deer are also tasks the American Bulldog has been utlized for. The cattle catch dogs are released on the herd and they "cut and catch" as needed. I'm not sure that they serve in the same manner as a Caucasian Ovcharka or Great Pyrenees, but they ones I've been around would NOT bother the livestock. If it did it signed it's own death warrant, obviously. As far as an American Bulldog being killed by a wolf or coyote I do not believe it for a second. Neither would stand a chance. Same with the larger livestock guard dogs. Of course, an American Bulldog would not have to be larger than the wolf to kill it. And since there are at least two ABs on the farms I was intimate with there would be wolf pelts to collect after the initial failed raid... Most farmers I knew had several American Bulldogs which were allowed run of the farm during the day. The hunting dogs were religiously kenneled, obviously. Usually, one of the Bulldogs ran free at night and the others were kenneled or one kept inside the home. Only a FOOL would attempt to breach the property, much less the house itself. Also, keep in mind that SEVERAL working American Bulldogs run with Plott Hounds when hunting boar so there is little dog aggression or the hunt is ruined. I once had a VHS tape from Hines' American Bulldogs in Mississippi in which there were several hunts filmed as well as dogs being agitated with a sleeve. I believe people misunderstand the working strain American Bulldog greatly. Even the Scott bred catchdogs will function as farm dogs, albeit a bit more aggressive towards fur-bearing intruders, such as coyotes, coydogs, cougars, bears, etc.