Can they eat it? / Grapes and raisins
Can horses eat grapes and raisins?
Fine in small amounts for horses (unlike dogs).
Horses are not known to suffer the kidney damage dogs do; a handful of grapes or a few raisins is a common treat. Keep it small for the sugar.
Loose manure with a lot.
Why
Grapes and raisins are not known to cause the kidney failure they cause in dogs, so horses are not considered poisoned by them the way dogs are. The concern is simply sugar and fruit acids. A large amount can upset the hindgut, shift the microbial balance, and loosen the manure. A few grapes or raisins offer a little natural sugar, water, and a treat horses often enjoy.
How much is too much
For a 1,000 lb horse, a handful of grapes or a small scoop of raisins is a reasonable treat, and a bucketful is too much. Ponies, miniatures, and metabolic horses carry more risk from sugar, so offer only a few. For a horse with insulin resistance or laminitis, skip them or check with your veterinarian first.
Horses
For horses in work or at pasture, grapes and raisins work best as an occasional treat rather than a daily item. Offer them flat in the palm so they are not swallowed whole in a rush. Stop if you see loose manure, and keep them out of reach of grazing or a loose feed bin.
Ponies and easy keepers
Ponies, miniatures, seniors, and insulin-resistant or laminitis-prone horses should have very few or none. Their sugar tolerance is low, so even a small handful can add enough to matter. Choose a lower-sugar treat instead and talk with your veterinarian about your horse's specific needs.
Safe alternatives
Try sliced apple without seeds, a few carrot coins, or a small piece of cucumber. Serve them in the palm or scatter a few in a feed tub so the horse eats slowly. Introduce any new treat gradually and watch the manure for a day or two.
Questions people ask
Can horses eat raisins in hay?
Raisins are not a normal part of hay, and a horse finding a few in a mix is unlikely to be harmed. Watch the manure, and keep larger amounts out of the feed bin.
How much grapes can a horse eat?
A handful is a reasonable treat for a full-size horse. Ponies and easy keepers need far fewer, and a bucket is too much for any horse.
Are grapes banned in horse competitions?
Treat rules vary by organization, so check your show's rulebook. Many shows allow small, ordinary treats, but confirm before you bring any to the ring.
Careful for horses means: fine in a small amount, prepared as described, and not for every pet; the details say when to skip it.
General information from veterinary guidance, not a diagnosis. If you are worried, call your vet or a pet poison line: ASPCA Animal Poison Control (888) 426-4435. Charges may apply.
Written by Hoofdeck editors · updated Nov 13, 2026 · from ASPCA Animal Poison Control, Merck Veterinary Manual and university extension guidance.