Every now and then, James Swanson, who lives in LaGrange Park, Illinois, likes to spend time at a lake near his cottage in Michigan. He takes his two dogs—Bjorn, an English cream golden retriever, and Fenrir, a golden retriever—with him and throws tennis balls for them to chase. For them, it’s purely fun. For Swanson, however, it’s all work. Every time he throws the ball, he aims it in a different direction or to a different depth. He throws it from the dock. Sometimes, he gets into the water himself. He does whatever it takes to to get a new
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