Terrier is a type of dog rather than one breed. The name comes from the Latin word for earth, because these dogs were developed over several centuries to hunt rats and foxes, often by following them into burrows. Listings usually use the label for small to medium dogs that look terrier-like, including mixes of Jack Russell, Rat, Cairn or Schnauzer lines.
Most weigh 10 to 35 pounds and have wiry or smooth coats with a confident, lively outlook. In Huntington Beach, that tenacity shows up on coastal walks, where a terrier may want to chase gulls or squirrels, so a six-foot leash matters. Size, coat and energy vary with ancestry, so meeting the dog tells you more than the label does.