The American Bandog Mastiff is a sweet, docile hybrid dog that has roots well cemented in the Mastiff, American Bulldog, and Pit Bull. These dogs tend to grow to a significant size and they become strong for their size. Thus, choose one wisely and you will find you have a friend for life. If you’ve never owned a dominant dog before, you may consider a different breed. These large, beautiful dogs can grow from about 85 pounds for a small female to 140 or so pounds for a large male.