Terrier is a type of dog rather than a single breed. The word covers dozens of breeds developed over several centuries to hunt rats, foxes and other vermin, often by going underground. Adoptable terriers are usually small to medium mixes with wiry or smooth coats, often with Jack Russell, Rat, Cairn, Schnauzer or Chihuahua in the mix. Most weigh 10 to 35 pounds and many live 12 to 16 years.
That long lifespan and spirited nature matter day to day. Terriers tend to be affectionate, loyal and bold, with strong opinions, and they often bark, dig and chase small animals. Shedding is moderate but ranges from low for wiry coats to heavier for smooth ones. Patient, reward-based training goes a long way, and meeting a dog in person tells you more than the label does.