Definition from Wiktionary, the free dictionary
- Hyphenation: bull‧dog
bulldog (plural bulldogs)
- A breed of dog developed in England by the crossing of the bullbaiting dog and the Pug to produce a ladies companion dog. Having a very smooth coat, a flattened face, wrinkly cheeks, powerful front legs and smaller hind legs.
- A shortened form of British bulldog.
- A stubborn person.
Derived terms 
breed of dog
British bulldog — see British bulldog
Related terms 
- 1971, Carol King and Gerry Goffin, “Smackwater Jack”, Tapestry, Ode Records
- Big Jim the Chief stood for law and order.... Now from his bulldog mouth... Came the cry, “We got to ride to clean up the streets...!”
- (transitive) To chase (a steer) on horseback and wrestle it to the ground by twisting its horns (as a rodeo performance).