How can you tell if you horse has a sugar allergy or not?

Allergy test. You would be amazed by how much horses are allergic to and you didn't know. It's expensive though but works well
My first horse wasn't allergic to sugar but she couldn't have much of it, we found out because she would start shivering and would show signs of discomfort and slight anxiety in the cross ties, then we got the vet out to diagnose her
Ask a vet lol
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