Duh, the "carrier dog". I couldn't think of the name, all I could picture was the way the little "hook" (the carrier dog) looks at the rear of the carrier. Usually the dogs are silver, and they're hook shaped (hook pointing rearward), with a little plunger spring on the side of the trigger goup. The dog could be broken, the carrier broken on that side, the plunger stuck, etc. In my experience, when the plunger sticks, or the carrier arm breaks, they won't come DOWN. Since yours isn't raising, I'd guess the head of your dog is broken.