The hives and the acorn eating are probably unrelated, but both are causes for concern. If the hives persist, have a veterinarian come out to examine your horse as soon as possible. Also, if he is eating acorns, you need to remove them from your pasture or remove him from that area. Acorns from oak trees contain a tannic acid, which can cause toxicity by affecting the intestinal tract and kidneys. Symptoms include lack of appetite, depression, and frequent urination. Changes in color of manure and urine, and abdominal pain can also be present. If your horse is exhibiting these symptoms, it is also time to call the vet.

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