Terrier is a type of dog rather than a single breed, so the dogs you meet in Springfield can range from a compact Jack Russell mix to a sturdier Schnauzer or Cairn cross. The name comes from the Latin word for earth, because these dogs were developed over several centuries to chase vermin into burrows. That history explains the digging, the sharp bark and the single-minded focus on anything that moves.
Most adoptable terriers weigh between 10 and 35 pounds and have wiry or smooth coats. They're loyal, funny and often stubborn, and they tend to attach firmly to their people. In a city of leashed walks and shared buildings, that means some training for manners around squirrels, other dogs and the doorbell. Since ancestry is often a guess, meeting the dog tells you more than the label does.