My husbands' horse, a QH/ Arab/ something else gelding, approx 15 yrs old, is losing weight. We had his teeth done about a year ago and they were BAD. He gained weight quickly after that. (we think the previous owner had NEVER had them done) The vet said he needed to have them done again in 6 months. Right at about that 6 month mark he started dropping weight again. We did the teeth. He almost seems to be worse since. He still drops LOTS of food. His coat, however, is beautifully shiny- healthy looking. He has been dewormed. We have him on senior feed and rice bran (once a day) and all the hay he can eat- Our other horses are all FAT. It's difficult to separate him from the others to feed him twice a day, but I feel like there must be something else going on since he has never had this problem and has always been in good weight on NO concentrates. What else could it be?