My gelding, Dylan, is being treated for Lyme disease. He’s on doxycycline for two months and is just over half way through treatment. I also have him on probiotics. I’ve noticed something interesting since about week 2. He used to have slightly loose manure and poopy water running down and caking on his back legs. Since the Doxy he’s been nice and clean! I would say it’s the probiotic but I tried that before he was diagnosed with the Lyme and it didn’t help. I though it might be interesting to anyone who has a horse with the same issue.
Fascinating! Is the probiotic now, the same one as before? Has anything else changed in his diet or environment?
I switched out the probiotic (because the first one ran out) after I noticed the runny poo had stopped. Nothing else had changed.
I co-run a group on FB, and quite a few of our members have horses with the fecal water issue, and I posted about your horse. They’re dying to know how all this turns out! Hopefully you will be able to come back to this thread and post updates as they happen? I posted the link to this thread but who knows who will bother to check that 
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My horse has twice, over the last few years, had runny butt combined with mostly normal poop. Given his color, its hard to miss… Anyway, both times the vet, who is an internal medicine specialist prescribed a long course of antibiotics, tapering down the dosage about every two weeks. I think a total of about 7 weeks. In our case it was metronidazole. It worked like a charm. So I’m guessing its the antibiotics, not the probios.
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I’ll try to remember to come back to this once he’s been off the Doxy for awhile and update. Last dose will be sometime around Sept. 1.
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What is the group you have on fb? And do you know if the doxy worked for the horse with fecal water syndrome?? Thank for your time .
I know this is an old thread, but I actually found the opposite happened. My gelding’s manure went from normal with liquid at the end of his poops like typical FWS to just mushy manure.
I ended up stopping it because we had started treatment before receiving Lyme results (which ended up negative) and I was worried that he’d end up with actual diarrhea.
I’m sure GI upset is typical with doxycycline like with any antibiotic, but unfortunately it wasn’t a quick fix for my boy’s FWS.
