Terrier is a label for a group of dogs rather than a single breed. The name comes from the Latin word for earth, because these dogs were developed over several centuries to go after rats, foxes and other vermin, often underground. On adoption listings, a terrier is usually a small to medium mix, and its ancestry might include Jack Russell, Rat, Cairn or Schnauzer lines.
Many terriers are loyal, affectionate and full of personality, but barking, digging and chasing squirrels or cats are common habits. Coats range from wiry to smooth, and size, coat and energy vary from dog to dog. Spending time with a dog and watching how it behaves will tell you more than the label does, so look at the pets listed on this page with that in mind.