Terriers are mixed breeds most of whom were crossbred by dog breeders in the UK for getting rid of vermin like mice and rats. Terrier dogs come in a range of sizes from large (Airedale Terrier) to moderately large (Border Terrier, Jack Russell Terrier) to small (Welsh, Yorkshire, and Cairn Terriers). Terriers can be brave, agile, and energetic as well as cute, friendly, and gregarious.
