Sable's brother, Spike has a lot of energy. He could fetch Frisbee till a person dislocated a shoulder.
Spike is lean because of all the attention he gets from my brother's brood.
But, like Sable, he is 10 years old now and does get tired. He is not quite the "chow" hound like Sable though. But he is just as lovable. He just can't get close enough to you when he sits next to you. He loves nudging you with that cold nose.