A standard calculus modeling problem is to find the quickest path from a point on shore to a point in a lake, given that running speed is greater than swimming speed. Elvis, my Welsh Corgi, has never had a calculus course. But when we play "fetch" on the shore of Lake Michigan, he appears to choose paths close to the optimal one. In this talk we reveal what was found when we experimentally tested this ability. Elvis will be available for follow-up questions.