i have an english bulldog about 2 yrs old she is a great dog. she gets nasty with my girlfriend when she and the dog are alone. she starts barking and trys to bite her although she never does. anytime she trys to disclipine her she gets nastier. she has gotten nasty once or twice with me and when she does i will hold her down or roll her over on her back and make her stay there for a little. when my girlfriend trys this it only makes the dog madder is there anything we can do to break her of this