I would not trust any mass butchered chicken not to contain Salmonella or some other crud.
Dogs aren't particularly prone to contracting a Salmonella infection due to their short digestive tracts. Additionally, their stomach juices are five times as acidic as our own, which kills it off pretty effectively. Remember, a big part of a wild canid's diet is carrion, i.e., rotting flesh and bone from previous kills. 40,000,000 years of evolution has equipped them to deal with it.
