Bullmastiff(redirected from Bull Mastiffs)
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Related to Bull Mastiffs: Staffordshire bull terriers
a large (100-130 lb), powerfully built dog with a large, square head, short muzzle, thick neck, deep chest and tapered tail. The coat is very short and brindle, fawn or red. The breed was developed from the Mastiff and the Bulldog. It is affected by a familial ataxia and entropion.