Horse Veterinary Questions? Ask an Equine Vet.
Good Morning and welcome! I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
It is not unusual under the stress of the hormone changes, that a pregnant mare will develop diarrhea. This can be scary since this can cause dehydration which will not help Missy before she delivers. It appears that she is close to delivery making the hormone changes even more dramatic which, as I mentioned, could be the cause and if this is the case, this will resolve once the foal is born. I would be sure to have her wormed and have your vet recheck her and run a fecal exam since this diarrhea can come from protozoan parasites such as Giardia that will ntotbe affected by the wormer.
To summarize, have your vet recheck her. This diarrhea may be normal for this time in the gestation period but if it is not, better to know now so treatment can be initiated.
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Good for you, Naomi! Having Missy checked is the best thing since there is a problem. Hopefully, after testing, this will easily be resolved and Missy and foal will do great!