Fit your dog with a slip chain collar (found at pet supply stores). Make sure it is the one made for very large dogs. It should be snug enough so that it will not snag on things and get pulled off, but loose enough that you can fit about two fingers between the collar and your dog's neck. These collars do not hurt your dog, but merely give you the control you need so you can contain her and make sure she does not get away from you and get into a dangerous situation.
Mastiff - Dog Lover
