Dreamcatcher Alpacas
Plant safety · Toxic

Is Onion Poisonous to Alpacas?

Onion (Allium cepa) — a garden plant. Here is what alpaca owners need to know.

Updated 2026-10-02By the Dreamcatcher Alpacas editorial team
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Yes — onion is toxic to alpacas.

Keep it out of pastures, hay and reach of fences, and never feed trimmings.

Onion (Allium cepa)
Onion (Allium cepa). Photo: Mehdi, CC BY-SA 3.0 via Wikimedia Commons.
Status
Toxic
Scientific name
Allium cepa
Family
Amaryllidaceae
Plant type
Garden plant
Also known as
Leek, Shallot, garden onion
Toxic parts
Bulbs and tops, raw or cooked
Toxic compound
N-propyl disulfide and other organosulfur compounds

Why it matters

Cull onions fed to cattle have caused outbreaks of anemia. Keep onions, leeks and chives out of alpaca feed.

Signs of onion poisoning in alpacas

  • Weakness and lethargy
  • Pale or yellow gums
  • Red-brown urine
  • Onion odor on the breath
  • Heinz-body hemolytic anemia

Signs can appear within minutes (cyanide, cardiac toxins) or only after weeks of exposure (liver toxins). Many poisoned camelids are simply found dead, so prevention is everything.

What to do if your alpaca ate onion

  1. Move the herd away and remove any remaining plant material, clippings or fallen leaves.
  2. Call your veterinarian immediately, even if the alpaca looks normal. Say what was eaten, roughly how much and when.
  3. Bring a sample or clear photo of the plant to help identification.
  4. Do not give home remedies, oils or try to make the alpaca vomit unless your vet tells you to.
  5. Keep the animal quiet, in shade or shelter, with water available. Write down the time and every symptom you see.
  6. Check every other alpaca that had access, then remove the plant permanently (including roots).

Emergency: call your veterinarian immediately. If you cannot reach them, contact an animal poison control service (in the U.S., the ASPCA Animal Poison Control Center or Pet Poison Helpline; fees may apply). Bring a sample or photo of the plant.

About the plant

The onion, also known as the bulb onion or common onion, is a vegetable that is the most widely cultivated species of the genus Allium. The shallot is a botanical variety of the onion which was classified as a separate species until 2011. The onion's close relatives include garlic, scallion, leek, and chives.From Wikipedia — “Onion”, licensed under CC BY-SA 4.0.

Where it grows

GBIF, the Global Biodiversity Information Facility, holds 21,316 recorded observations of Allium cepa L. worldwide, including 1,790 in the United States. It belongs to the Amaryllidaceae family, together with Daffodil, Garlic, Wild Onion & Wild Garlic. See the occurrence map on GBIF.

Frequently asked questions

Is onion poisonous to alpacas?
Yes. Yes — onion is toxic to alpacas. Cull onions fed to cattle have caused outbreaks of anemia. Keep onions, leeks and chives out of alpaca feed.
What part of onion is toxic to alpacas?
Bulbs and tops, raw or cooked.
What are the symptoms of onion poisoning?
Weakness and lethargy, pale or yellow gums, red-brown urine, onion odor on the breath and heinz-body hemolytic anemia.
Is dried onion safe?
Drying does not reliably make poisonous plants safe. Treat dried leaves and contaminated hay with the same caution.

Keeping pastures safe

  • Walk every paddock and fence line each season and remove toxic plants, including roots.
  • Never throw garden, hedge or lawn clippings over the fence.
  • Check pastures after storms for fallen branches (cherry, red maple).
  • Buy hay from known sources and inspect it for weeds.
  • Keep pastures well managed — hungry alpacas eat plants they would normally avoid.

Browse the full toxic plant checker, the printable list of poisonous plants and the list of safe plants.

This page is educational and does not replace advice from a veterinarian who has examined your animals. Camelid medicine uses many drugs “extra-label”, so dosing must come from your vet. In an emergency, call your vet first. Read our disclaimer · How we write and review content.

Data: plant status compiled from veterinary toxicology references (see sources); taxonomy and occurrences from GBIF; identifiers from Wikidata Q23485.