We have dealt with dog packs and viscous loose dogs for years. We carry all the time, and when we leave the house we commonly carry a rifle as well. Heck, the wolves and coyotes are nary an issue. Even the grizzlies are not so much of a problem. Just about everybody up here will shoot an unknown dog on sight, especially if they do not have a collar. Aggressive.. DRT. Get hurt up here and it can easily be an hour before you can get help. Breeds that I am most wary of are Poodles (standard), Labs, Retrievers, Spaniels, Rotts, Dobies, and Terriers.
-Bidah