Thank you all for the wonderful feedback. I am new to this site and it is terrific. She was on a feed that the breeder mixed herself so I can't say exactly what was in it. I decided to try a beet pulp based feed Purina Complete Advantage but that caused the same problem.
She is so much better...
I recently became the proud Mom of a 5yr old mare. I have owned her for the last 3 months. When she arrived I was told she was about 2 weeks pregnant. She has had diarrhea since she has been with me. She has been wormed and gets treatment for sand twice per week (has been tested and has no sand...