8 Fastest Dogs on the Planet

Photo by: Sam Clark, Animal Photography

1. Greyhound

When you think of fast dogs, the tall and lean Greyhound is the first breed that usually springs to mind. This long-legged, smooth-coated

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Photo by: Sam Clark, Animal Photography

1. Greyhound

When you think of fast dogs, the tall and lean Greyhound is the first breed that usually springs to mind. This long-legged, smooth-coated racing breed has been clocked at speeds up to 45 miles per hour, sparking its nickname: the 45-mph couch potato. Why this nickname? This is a breed blessed with speed bursts when overcoming prey, especially hares, but one who craves lounging on sofas in between races.

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Mon, Sep 24, 2012 11:48 AM EDT

Go Dog, Go was the title of a famous children's book penned more than 50 years ago by P.D. Eastman, but it is also what we say when we see some of these dogs take off running. Check out our slideshow of amazing dog breeds that were built for speed.

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