Q. Horse has Diarrhea seems to be weak/depressed. Symptoms seem to have gone on for a mounth or more. Horse is loosing weight. Horse is lessthan10years
A. Diarrhea is a common symptom for many different diseases. There are a number of reasons for diarrhea in horses, such as parasites, excessive ingestion of sand, chronic Salmonella infection, inflammatory or infiltrative bowel disease, neoplasia (lymphosarcoma in the gut).
I recommend getting your vet out to do an exam and comprehensive labwork on him, including blood and fecal analysis. Based on these results, your vet can better advise you how to treat the diarrhea and get your horse feeling better..