My mustang gelding is suffering from a weird case of ongoing (chronic, I guess) diarrhea. Everytime I ride out to an arena or trail, he poops and it's almost always runny. Not liquid runny but definitely way too soft to be normal. And it's usually green-ish as well. At home his poops seem to be more normal sometimes but I don't see him poop as often at home (don't live where I keep him) as I do when we go ride.
I took him to the vet who took a stool sample and said worms weren't a problem, no bacteria or other weird stuff showed up in the sample. He gave me a probiotic and sent me on my way. The probiotic is now gone and it didn't really help. I would say his stool got 10% harder sometimes but other times was just as soft and runny as normal.
I'm leaning toward a nervousness issue but I have taken him to the arena countless times and desensitized him to everything there. He also doesn't act out of character or nervous while I'm riding, besides the runny poop.
If it is nervousness, how can I help this? Was thinking about running another scope for ulcers but we did that when I brought him home 3 months ago and he was clear.
He gets no grain and is on a 60 acre grass pasture, fertilized but he is the only horse out of 10 that has runny poop consistently.
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