bulldog
Longman Dictionary of Contemporary English 5++LDOCE 5++bull·dog /ˈbʊldɒɡ $ -dɒːɡ/ noun [countable] 
HBAa powerful dog with a large head, a short neck, and short thick legs 斗牛犬
HBAa powerful dog with a large head, a short neck, and short thick legs 斗牛犬Examples from the Corpus
bulldog• Like a bulldog it refuses to let go, even when savagely attacked by the desperate victim.• The beefy chest of a bulldog.• He reminded Harry, in his build, expression and asthmatic wheeze, of a bulldog peering ill-humouredly from his kennel.• Want to show a bulldog rolling its eyes?• Both bite their attackers and hang on like bulldogs, letting the venom trickle into the wound as they do so.• Sadly, this right to leave your bits and pieces to your budgie or bulldog is denied those with hereditary titles.bull·dog nounChineseSyllable
Corpus large head, with a short a dog powerful a
bulldog
bull‧dog /ˈbʊldɒɡ $ -dɒːɡ/
noun [countable]
a powerful dog with a large head, a short neck, and short thick legs
bull‧dog /ˈbʊldɒɡ $ -dɒːɡ/
noun [countable]a powerful dog with a large head, a short neck, and short thick legs