Can they eat it? / Lawn clippings
Can horses eat lawn clippings?
No. Fermenting piles cause colic and choke.
Cut grass ferments fast and horses bolt it without chewing. Never dump mower clippings over a fence; the lawn itself, grazed, is fine.
Colic, choke, laminitis if a lot is eaten.
Call your vet now. Note what was eaten, how much and when; do not wait for signs.
Why
Fresh lawn clippings ferment quickly once they are cut and piled, so they can turn sour, hot and mouldy within hours. Horses also tend to bolt loose clippings without chewing them properly, which invites choke and gas or impaction colic. Clippings can carry sugars that spike when fermenting, and grass sitting in a heap may grow mould. The lawn itself, grazed slowly and in a normal way, is a different matter and is generally fine.
How much is too much
A small handful of fresh clippings is a minor thing for a 1,000 lb horse, but a pile or a wheelbarrow is a large amount. There is no safe quantity to dump on purpose, because the risk comes from fermentation and bolting, not from size alone. Ponies, miniatures and metabolic horses are more sensitive to sugar and gas, so even a modest amount can matter more for them.
Horses
Full-size horses in work or at pasture should never be given mower clippings from a pile or fence line. Keep them off the paddock, away from feed areas, and out of the path of the mower. Let horses graze the lawn as it stands, and keep a horse off freshly cut grass that has been raked into a heap where it can ferment.
Ponies and easy keepers
Ponies, miniatures, seniors and insulin-resistant or laminitis-prone horses should not have any cut lawn, since the sugars and fermentation can trigger laminitis as well as gut upset. Keep these horses off lawn that has just been mown and away from clipping heaps. Grazing restriction is often the wiser choice for easy keepers.
Safe alternatives
Offer a flake of good-quality grass hay, which is steady and digests well, or a measured amount of a plain hay pellet soaked until soft. A few minutes of supervised grazing on a established pasture is another option. Always serve these in a clean feeder so the horse eats slowly and chews fully.
Questions people ask
Can horses eat lawn clippings in hay?
Clippings should not go into hay or a hay net. Mixed-in clippings can ferment inside the bale or net and cause mould and gut problems. Stick to properly cured hay that you have had tested or checked for quality.
Are lawn clippings safe after frost?
No. Clippings from a frosted or recently chilled lawn can still ferment quickly and cause colic or choke. Frost does not make them safer, so keep horses away from any clippings.
My horse ate a pile of clippings. What should I do?
Call your vet now, even if your horse looks fine. Note what was eaten, how much and when. Do not wait for signs such as colic or choke to start before you call.
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.