My mare (age 28) has been having loose, previously watery but now slightly formed cow plops for almost 2 months. She is boarded and with the extreme cold where we are, I haven't been out to see her for 2 weeks. But the barn owner thought she was doing better. Initially we thought she was just anxious because her pasture mate and love had just been sold and moved away. So we put her on some probiotics and omeprazole for a bit and took her off Equiox (which she NEEDS for arthritis). A couple of weeks ago, the barn owner put her back on Equiox. She can hardly move without it. So I am suspecting this is the culprit. Vet is coming out today and will check her and do fecal tests. (By they way, she hardly ever has eggs in her fecal counts so highly doubt that will be an issue this time either). I'm worried that she wont' be able to stay on Equiox and she really is not comfortable without it. I have tried joint supplements and supplements for arthritis and they weren't helpful. To be honest, I don't really believe in them as medicinal. If they are strong enough to make an impact on arthritis like she has, then who knows what else they will do. They are not regulated. The barn owner is pushing to put her on a supplement he has seen success with but it's not going to be enough, in my opinion. We'll see what the vet says. Just wondering if others had problems with Equiox or diarrhea in older horses who otherwise seem healthy.