Officially, the world’s tallest dog breed is the Irish Wolfhound. Females measure up to 34.5 inches (97.6 cm) at the withers, with male dogs being even taller, at 37 inches (96.5 cm). They are a lot taller than even Great Danes, who “only” grow to about 32 inches (81.3 cm), and they make German Shepherds look like teddy bears with their 26 inches (66 cm) of height. If a fully-grown Irish Wolfhound were to stand upright on its hind legs, it would be around seven feet tall! They should really start considering a career in basketball.