Terrier is a type of dog rather than a single breed. The name comes from the Latin terra, meaning earth, because these dogs were developed to hunt rats, foxes and other vermin, often by following them into burrows. Dozens of breeds share the label, from tiny Yorkshire Terriers to the much larger Airedale, and many adoptable terriers are mixes with Jack Russell, Rat, Cairn or Schnauzer in their background.
Most are small to medium, roughly 10 to 35 pounds, with wiry or smooth coats and a lively, confident outlook. Many are loyal, affectionate and funny, though barking, digging, chasing squirrels and a stubborn streak are common. With squirrels on nearly every block, a secure leash and a well-fitted harness matter. A dog's size, coat and energy depend on its mix, so meeting the dog tells you more than the label.