bull mastiff
US /ˈbʊlˌmæstɪf/
UK /ˈbʊlˌmæstɪf/

1.
Bullmastiff
a large, powerful breed of dog, typically fawn or brindle with a black mask, originally bred from the bulldog and mastiff to guard estates.
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The Bullmastiff stood guard at the entrance, a formidable presence.
O Bullmastiff estava de guarda na entrada, uma presença formidável.
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She adopted a rescue Bullmastiff with a gentle temperament.
Ela adotou um Bullmastiff resgatado com um temperamento gentil.