You never see your dog running nonstop around and around in a circle for an hour. If he did, you'd think there was something wrong with him. Instead,… - Erwan Le Corre

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You never see your dog running nonstop around and around in a circle for an hour. If he did, you'd think there was something wrong with him. Instead, he'll chase something, roll around, sprint, rest, mix things up. Animal play has a purpose, and it's not hard to surmise that human play should as well.