My mini mare has been having poop problems for like 3 years and I have no idea why. The vet couldn't find anything wrong with her, her weight is good, and she is dewormed regularly. She poops normally (formed) and then the rest is all fluid. It squirts out all through her tail and all over her stall walls. Fluid even comes out when she passes gas. She acts fine. Appetite is normal and drinks plenty. Her tail is all clumped with poop and is really nasty. I have tried ProBios and it did nothing. Anything I can do for her? The vet even took a fecal on her and it was normal.