I purchases a 16 yo thoroughbred gelding 2 weeks ago. He had dark yellow urine, but not bad. He also had a 2 inch sore on the top of his croup and dry skin on his hip bones. The turn out area he is in is rocky. He was eating 1 alf AM/PM. I scrubbed the sore with a betadine scrub, changed him to 1 alf am 1 grass pm, due to the fact that the alot of the alfalfa flake was left in his feeder. within a couple days, the sores had went down his hindquarters and up his spine. There are small scabs /dry skin all over his back. Alot of ppl have told me it rain rot but im in arizona, it hasnt rained here steadily in 6 months. I have continued scrubbing , but changed to a chlorhex scrub incase he was allergic to the betadine. The sore on his croup has healed but the scabs continue to spread. NOW, he is not eating his grass well, and his urine is a dark brown. Someone also mentinoned stomach ulcers for his not eating. I have only rode him once due to the sores on his back, i turn him out in the arena to stretch. I know that seeein the vet is the #1 answer.=, but there is no large animal vet where I live, and as i Just purchased him i dont have a trailer to haul him the hour and a half to the nearest large animal vet. Any ideas would be great until i can do so. IF u need more info, let me know.