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I'm no expert by any means, but could it possibly be jealousy? When you bought your new bully did you know that they are prone to dog aggression more than any other breeds? I really, terribly, hate to say this but you may have to give up one bulyl if things don't brighten up. Possibly calling a professional dog trainer to do some in home dog training with you and your dogs is a good idea, even though it can be pricey.