Answer: bulldog

AnswerCrossword Clue
BULLDOGSquare-jawed pooch
BULLDOGCritter on a Mack truck
BULLDOGStubborn person
BULLDOGWell-known mascot.
BULLDOGWrestle a steer
BULLDOGEli's pet?
BULLDOGDetective Drummond
BULLDOGMuscular canine
BULLDOGGeorgia mascot
BULLDOGSymbol of tenacity
bulldog(at Oxford and Cambridge Universities) An official who assists the proctors, esp. in disciplinary matters
bulldogA dog of a sturdy smooth-haired breed with a large head and powerful protruding lower jaw, a flat wrinkled face, and a broad chest
bulldogA person noted for courageous or stubborn tenacity
bulldogto wrestle and throw a steer