Terrier (from Old French chien terrier (“terrier dog”) from chien (“dog”) + Old French terrier (from Medieval Latin terrarius (“of earth”) from Latin terra (“earth”))) is a type of dog originally bred to hunt vermin. A terrier is a dog of any one of many breeds or landraces of the terrier type, which are typically small, wiry, game, and fearless. Terrier breeds vary greatly in size from just 1 kg (2 lb) to over 60 kg (132 lb, e.g. Black Russian Terrier) and are usually categorized by size or function. There are five different groups of terrier, with each group having different shapes and sizes.