The Bulldog, also known as the English Bulldog or British Bulldog, is a medium-sized dog breed. It is a muscular, hefty dog with a wrinkled face and a distinctive pushed-in nose.

The first reference to the word "Bulldog" is dated 1631 or 1632 in a letter by a man named Preswick Eaton where he writes: "procuer mee two good Bulldogs, and let them be sent by ye first shipp". In 1666, English scientist Christopher Merret applied: "Canis pugnax, a Butchers Bull or Bear Dog", as an entry in his Pinax Rerum Naturalium Britannicarum.