According to legend, the Rat Terrier got his name from Theodore Roosevelt. These dogs were brought into the White House to help control a rat infestation, and they made quick work of the rodents, eliminating them completely from the executive mansion. They are high energy dogs who love to be “at work.” Rat Terriers are small, but they need a lot of exercise and activity to maintain health, happiness and an even temperament. These little dogs can chase and fetch for hours at a time, without getting bored. Their size and upbeat personality makes them appealing for all family situations as long as they get proper exercise.