Terrier is a type of dog rather than a single breed. The name comes from the Latin word for earth, because these dogs were developed over several centuries to hunt rats, foxes and other vermin, often by following them into burrows. Dozens of breeds share the label, and adoption listings often use it for small to medium mixes with a wiry or smooth coat and uncertain ancestry.
Many terriers are affectionate, loyal and full of personality, but barking, digging, chasing small animals and a stubborn streak are common. In Fremont, where most homes are single-family houses, a secure yard helps, but a bored terrier will still dig or bark, so daily activity matters as much as fencing. Lifespans of 12 to 16 years are typical.