This working and herding dog is quite the clever one. They are keen and seem to take everything in around them. The smartest dog in the world is a member of this breed: Chaser. who knows over 1,000 commands and toys. This breed is quite reserved but is not afraid to socialize or show off its energy. They love being active and do well with active couples or families. They can grow to be about 30 to 45 lbs and live to be 13 to 17 years old.