We have a horse boarder who is boarding two old horses (Tenn. Walkers) with us (one 26+ years old, one 13+ years old). Per contract, the boarder is responsible for his own vet care, wormer, etc. We only provide hay, grain, water, turn out to pasture and a clean stall. This boarder has been with us for 5 years and has never had a vet to see his horses. He had not been to see his horses in nearly 3 years (he was 2 years behind in boarding fees). In the spring of 2008 while we were worming our herd, we put his horses on a worming program with ours (we noticed the coat on his horses were dull and we thought the horses may have a bad case of worms). Our other horses seemed to do well with the wormer, however his horses seemed to loose appitite and lost a considerable amount of weight, We even began to give his older horses expensive senior food and special weight gain.... is it normal for a horse that has not been wormed recently to stop eating or loose weight after going on a worming program? The older horse seemed to loose the most weight. We also noticed the older horse when in her stall there seemed to be a considerable amount of unground/undigested food in her stool... Could the lack of vet care (teeth care) be causing this weight problem... We were finally able to contact this boarder after sending multiple certified letters... This boarder came up to get his hourse and feels he should not pay back board since he is convinced we have not feed his horses, and that is why they are thin. We were so concirned that we contacted our local Animal Control Officer to inspect our horses as well as his. He said that the boarders were a little thin, however he saw no problem that would warrent him even filling out a report. This boarder says he is considering taking us to court to get back the prior board he has paid us. NOTE: He is still nearly 1 year behind in board and we are considering taking him to court to collect the back board. His last conversation was that if we could convince him that there may be other reasons for his horses being thin he would avoid taking us to court and pay the back board. Any help/suggestions any of you can provide is appreciated.