Definition: "Big dog" is a slang term for the driver. The driver is the biggest club in the bag, after all: largest clubhead and, usually, the longest shaft; and the driver hits the golf ball the farthest. It's the big dog of golf clubs.
"Big dog" is also part of an expression you'll sometimes hear: "Time to let the big dog eat." That phrase might be uttered by a golfer who hasn't been using his driver, but decides to let 'er rip on a given hole.
Also Known As: Driver, big stick
Examples:
The Golf Guide used his big dog on the home hole.
