[tlhIngan Hol] qovIj ngavyaw' relative size

Suppose you have a full-grown (or is it fully-grown ?), german shepherd. Would you characterize it as {qovIj} or a {ngavyaw'} ? And lets say, you have a {ngavyaw'} puppy.. Would you characterize it, as a {ngavyaw'} or a {qovIj} ? Or would you play it safe, and say {ngavyaw' ghu} ? And, to take this to the limit.. If you had a {qovIj} which took steroids and grew the size of a small car, how would you say it ? On the contrary, if a {ngavyaw'}, matured chronologically, never attaining the expected size, but remained very small, would you still call it a {ngavyaw'} ? ~ bara'qa'