My 19 yo quarter horse mare has developed what SmartPak is calling Fecal Water syndrome( watery discharge after she has passed manure that stains her hindquarters and tail). Our vet was out yesterday and I asked if she had any ideas what was causing it and what I could do about it. She suggested trying Equishure. I see on here that some people suggest using probiotics or prebiotics which is in the feed she gets now otherwise I'd go try that first. Anyone have other ideas or find something that works? Other than this she is in good health, no other conditions.