Able to reach top speeds of 40 mph, the greyhound is the third-fastest land mammal — only the cheetah and Thomson's Gazelle are faster. http://www.squidoo.com/fastest-dog-ever Fri, 17 Feb 2012 21:33:02 -0600 FeedCreator 1.7.2 Thu, 10 Apr 2008 09:58:56 -0600 http://www.squidoo.com/fastest-dog-ever Able to reach top speeds of 40 mph, the greyhound is the third-fastest land mammal — only the cheetah and Thomson's Gazelle are faster. Thu, 10 Apr 2008 09:58:56 -0600