The Bullmastiff is unsuitable as an outside dog. The affection of a lap dog is combined with his weight and strength. Any owner must be prepared to provide obedience training mixed with a lot of kindness.
Although the exact dates of this breed's origins are not known, literature mentions a combination of a Bulldog and a Mastiff that was known as the "Strong-Bulldog." Breeders have been exceedingly careful to select particular mental and physical characteristics. Today's Bullmastiff has little in common with his original Bulldog or Mastiff ancestors.