The name is as plain-spoken as the 19th century Americans who developed the breed. Rat Terriers were bred to kill rats and other vermin around the farm. And after a long day of farm work, they'd still have the energy to be a robust playmate. Your Rat Terrier puppy will be a bundle of curiosity and energy. Easily trainable, he excels at sports like lure coursing and agility. He's loving and loyal to his family, but may be reserved with strangers. He's at his best with lots of socialization, exercise and time with his family.