Grint hound
A Grint hound was a species of dog on Qo'noS. 

In 2374, while babysitting Kirayoshi O'Brien, Worf pretended to be a grint hound and chased the toddler around the room. Unfortunately, Kirayoshi did not look where he was going and banged his head against the edge of a table. ()

External link 
 

de:Grint-Hund
Qo'noS
Canines