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Flickr/haroldmeerveld CC by 2.0

This bow-wow’s got brains and brawn. Akin to the straight-A, letterman-jacket-wearing captain of the football team, not only is this breed among the fittest of fit, but it’s also considered one of the world’s most intelligent dog breeds. “[Border Collies] scream intensity, strong work ethic and the need to please. They want to ‘perform’ for you. They excel at sports like dock diving, flyball, agility, obedience trials and many more,” says Swanson.