Rottweilers were originally bred to be hard-working, protective dogs. These powerful dogs have incredibly strong jaws and excel at police work, herding, and watch-dogging, as well as obedience. Rotties are exceptionally smart, which makes them easily trainable, and they are usually very happy, goofy dogs. They tend to be protective of their families, but make loyal and affectionate pets. Rottweilers are large dogs, weighing in on average at around 100 lbs. fully grown, and are fairly active and like to exercise.