1) Dog breed 2) Short-muzzled dog breed 
(from the article `mastiff`) The bullmastiff, a cross between the mastiff and the bulldog, was developed in 19th-century England; it was used chiefly to discourage poaching on ...
A large, heavy-set, powerful dog of a breed developed from the bulldog and the mastiff.
one of an English breed of dogs having a short, fawn or brindled coat, produced by crossing the bulldog and the mastiff.