Sometimes I’m amazed over how tall dogs are. Well, Gibson, a five-year-old Harlequin Great Dane, is the world’s tallest dog and will be at America’s Family Pet Expo in Costa Mesa, CA this weekend. Gibson measures more than 43 inches from the floor to his shoulder and weighs 170 pounds. He can stand more than 7 feet tall on his hind legs. Gibson has been on the Tonight Show with Jay Leno, Oprah and Ellen DeGeneres. Gibson is also the spokedog for the Veterinary Diagnostics Institute (a company that detects heart disease in dogs) and at the expo, Gibson will be promoting the Canine CardioCare blood test. I’m glad that Gibson is using his celebrity status for good.