My suggestion is Probiotics. Smart Gut Ultra is a good one that will help not only protect your horse from colic and issues of the gut but has the Probiotics in it. One of my guys was a nervous traveler anytime we went camping I think he thought he was never coming home. He would be worried and have the “runs” the whole time. I would be giving him Probios the whole time we were gone. Now that he is on Smart Gut Ultra…all gone. He is happy and has healthy poos on our trips.