Each dog should be judged on its temperament, hard for anyone else to say what it will be like. One word of caution I would offer - without seeing the dog I can't say for sure but from your description I would be very worried it could be mistaken for a Pit Bull Terrier or Pit Bull type, both of which could be seized by the authorities at any time. How would your family feel if at some point in the future the dog was taken away and you taken to court for ownership of an illegal banned dog (whether or not it is actually one). Breed Specific Legislation is a total nightmare for anyone with a bull breed, and personally I would not take the risk.