I am very worried about one of my llamas (I have three). Due to their thick winter coats, I didn't realize that one has gotten VERY thin over the past couple of months. He has always come eagerly to the hay with the others, they spread out and each munch on their own pile, and he hasn't seemed off in any way. But I just happened to run my hand down his back the other day and I can feel every bone! I'm now really worried. I then cornered the other two and checked their condition, and they are both fine. What could be wrong with him? They were wormed in the fall, and I'm going to do it again immediately, but are there other things that this could be? I hadn't been giving any grain, but went out and bought some right away and have been giving him several meals a day the last couple of days. He eats that eagerly, even desperately. Could he be having a problem eating/digesting the hay? He doesn't seem to be getting bullied, and I spread the hay out enough that no one can hog all the piles. I'm having the vet out, but what is the best way to get weight back on a llama, if we rule out parasites or other issues?