History and Health of the Brussels Griffon Dog Breed: These dogs date back to the 1800's in Belgium where they were used as ratters in the stables. (petwave.com)
Although they were bred as a companion dog many of the little bulldogs in their history were quite useful as ratters in farming communities. (professorshouse.com)
Affenpinschers, affectionately dubbed «monkey dogs» because of their primate - like faces, were originally used as ratters on farms. (cuteness.com)