Star Trek VI: The Undiscovered Country (1991)
Animal Action

The only animal action in the film involves a Klingon guard dog in scenes at the penal colony and aboard the spaceship. In order to make the dog appear to be “other worldly”, he was fitted with a body costume and head gear. An American Humane Representative was present for costume fittings in order to assure that the materials were light weight, fit comfortably and were properly ventilated. The dog was gradually acclimated to the costume over a period of more than twenty sessions. During filming, AHA Reps were on the set to assure that the dog would not spend more than thirty-five minutes in costume without the head piece, and no more than twenty minutes in full costume. A fake puppet head was used for some close-ups. All the dog action was basic A to B or barking or growling.