What can I do to prevent my horse from getting some ulcers (he is very sensitive to his environment)?

Make sure he is always hydrated, lots of hay, and gradually tighten your girth.
Smart pak supplements
Aloe Vera juice
TuffRock G.I (Gastro Intestinal) is fantastic. It naturally works to help prevent stress stomach ulcers and has so many other benefits.
Ulcer Gard works great, but there are many other supplements that could help. Contact you vet and see what they recommend!
Ulcer gard
Talk to your vet. Maybe there is a supplement that could help prevent ulcers
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