Excellent item in Runners World Magazine, exploring the best dog breeds for running with.

Sure, most fit canines could thump us in a 5-K, but anyone who has ever watched leashed runners at a local park knows that some animals are better athletes than others. But how does your dog rate?

Or if you're searching for a perfect running partner, what kind should you pick?

Not surprisingly, it depends. There's no perfect running breed for all conditions, and a dog's personality and temperament are as important as its pedigree, says Susan Dicks, D.V.M., an Albuquerque-based veterinarian and marathoner. Mongrels can make fine runners, espeically if they're medium-sized, alert, and eager.

Source: http://www.runnersworld.com/article/0,7120,s6-238-527–13611-0,00.html