I did consult with SmartPak and they were wonderful. We did try SmartGut Ultra, it did not give us much help. We also tried Sand clear and it would help some as long as he stayed on it. It seemed to soak up the fluid in the bowel some, and as soon as you would work your way off of it we were back at it again. Thank you for your input and response, I was desperate at times to find anyone with a horse like mine and had numerous consults with GI experts. So imagine my surprise when out of the blue a treatment for a different problem (the hives)took care of it. It blew us away!