I took in a rescue shetland pony, 8 years old and apparently healthy. What I didn't know is that she was also pregnant! Her foal, a big filly, was very bright and healthy, easy delivery, good nurser, no apparent problems. She's eleven days old. Today she had sudden onset diarrhea, pretty bad. Very liquid, covers her whole butt right down to her hocks. Still running around and nursing normally.
I forgot to mention, mom had all her vaccinations for a pregnant mare, but not wormed since her fecals were totally clean.
I read about foal-heat diarrhea, should I assume that's what this is, or should I have the vet see her right away? I read that if it isn't foal-heat diarrhea, it could be something rapidly fatal. I am a novice horse owner, don't know much. They are pastured, by the way, on about two acres of grass (and thistles).
Thanks for any help you can give, I'd be totally devastated if anything happened to my baby!