I have a 9 y/o ottb mare. She has a lot of puzzling little symptoms that I beginning to think may be something more. She constantly has rain rot and mud fever. I get it to pretty much resolve, it rains (or snow) while she doesn't have her sheet/blanket on and I am not there to put it on and its almost instantly awful. Skin and Hair supplements do seem to make it better but do not get rid of the problem. She also stocks up bad. She is outside 24/7. Last year she stocked up but it always completely resolved after riding. This year it all the way up her legs and it gets somewhat better but her ankles are still swollen. She doesn't heal fast. She had a wound on her face when I first got her and it took almost 4 months to completely heal even with giving her penicillin and keeping it clean daily. Another problem I have with her is her topline. No matter how much I ride it never seems to build up. Her muscles everywhere else are still sculpted just her topline never seems to catch up.
this is probably unrelated but her feet grow really fast but they are discolored and cracking a lot more than last year.
I am thinking maybe a deficiency...??