This does not surprise me since Giardia crossed my mind. Metronidazole works on protoza and ameboa which indicates the water as the most likely source of the problem. I will be talking to my vet about this as well. Thank you so much for sharing this information.
After rolling this around in my mind, I want to add that my other 2 horses do not have this problem. The oldest mare is 27-1/2 and it started last winter. The other 2 mares are 24-1/2 and 23-1/2; they eat the same hay and drink the same water. Have to wonder if these organisms are always present but when their immune system starts to break down, this is how they effect the horse but why only on dry hay – whatever works is all that matters.
- This reply was modified 2 years, 1 month ago by midnightsun.