Scaly, wolf-sized animals kept as pets by some Klingon warriors, best known from the beast that sits beside Commander Kruge on the bridge of his bird-of-prey in 2285.
The Klingon monster dog is a fanged, spiny, lizard-skinned animal about the size of a large hound. The only one seen on screen belongs to Commander Kruge, who keeps it beside his command chair and treats it with more affection than he shows his crew.
The animal appears in Star Trek III: The Search for Spock. It growls at Kruge's officers as he studies the stolen Genesis data and lies at his feet during the hunt for the Genesis planet.
When the crippled Enterprise manages to fire torpedoes into the bird-of-prey, the creature is killed by the damage to the bridge. Kruge is briefly seen grieving over its body before he turns back to the battle. The beast was a puppet built for the film, and its name comes from the production.