The Rat Terrier is an American farm dog, developed in the late 1800s and early 1900s from English terriers and feists, with Whippet speed and Beagle scenting ability added later. Families kept them to clear barns of rats and chase squirrels. The breed comes in miniature and standard sizes, roughly 10 to 25 pounds, with a short, smooth coat that is always pied with white.
Many are cheerful, affectionate and happy to stay close, and they tend to be more biddable than other terriers. They also have quick reflexes, strong prey drive and a talent for escaping. In a city with squirrel-filled parks and older homes with yards, that means leashes on walks and a fence checked for gaps. Each dog is different, so judge the dog in front of you.