Irish Wolfhound. The tallest dog in the world! Now not necessarily the largest dog, they weigh less than say the Great Dane, but if you stand them up on their hind legs, they can reach 7 feet! And they’re an old breed… Ancient Celtic writings suggest that Irish Wolfhounds existed as early as 273 BC. . . . . . . . #IrishWolfhound #animallover #animalplanet #wildfacts #animalkingdom