A greyhound (or Amazone) is a cocktail consisting of grapefruit juice and gin or vodka mixed and served over ice.

If the rim of the glass has been salted, the drink is instead called a salty dog.

This cocktail was served at Greyhound's restaurant chain, Post House, that was located at bus terminals.

"[1][2] After World War II, the recipe was more commonly made with vodka instead of gin.

[3][better source needed] For the greyhound, twist of lime or lemon.