Grint hound

The grint hound is a canine animal that originates from Klingon space. They are known to hunt razorbacks.

A popular childrens story featuring the animal is The Adventures of Lin Marna and the Grint Hound Challenge. 

In 2374, Worf,, while looking after Kirayoshi O'Brien, pretended to be a grint hound and chased the toddler around his quarters.