Many animals run and still retain their fur. Pretty much all of the known mammals that have lost most of their fur/hair are either aquatic (whales, dolphins, du

Many animals run and still retain their fur. Pretty much all of the known mammals that have lost most of their fur/hair are either aquatic (whales, dolphins, dugongs...) or regular waders (pigs, hippos, elephants...); the only exceptions live underground or in crevices.