My dog ate onion (raw, cooked, powder) — what should I do?
Depends on the dose — check the calculator
What to do now
- Risk depends on how much onion your dog ate per kg of body weight (1 mg/kg → YELLOW, 5000 mg/kg → RED). Use the PawPanic calculator with your dog's weight and the amount.
- If you can't estimate the amount, assume the worst and call your vet or a poison hotline.
- Remove any remaining material and keep packaging/labels — the vet will want product names and amounts.
- Do not induce vomiting unless a vet or poison-control expert tells you to.
- Note the time it was eaten, roughly how much, and your dog's weight.
Why it's a problem
N-propyl disulfide and other sulfur compounds damage red blood cells (Heinz-body anemia).
Symptoms to watch for
Weakness, pale gums, red/brown urine, fast breathing, vomiting.
When: GI within 1 day; anemia 1-5 days
⚠️ Onion powder and dried soup mix are far more concentrated; treat any powder ingestion as RED.
Frequently asked questions
Is onion (raw, cooked, powder) dangerous for dogs?
It depends on the amount and your dog's weight. N-propyl disulfide and other sulfur compounds damage red blood cells (Heinz-body anemia). Use the PawPanic calculator or call your vet.
What are the symptoms if my dog ate onion (raw, cooked, powder)?
Weakness, pale gums, red/brown urine, fast breathing, vomiting.
How soon do symptoms appear after a dog eats onion (raw, cooked, powder)?
GI within 1 day; anemia 1-5 days
Is there anything else to know about onion (raw, cooked, powder)?
Onion powder and dried soup mix are far more concentrated; treat any powder ingestion as RED.
What should I do if my dog ate onion (raw, cooked, powder)?
If you can't estimate the amount, assume the worst and call your vet or a poison hotline.
Who can I call for help?
ASPCA Animal Poison Control (888) 426-4435 or Pet Poison Helpline (855) 764-7661, both 24/7 (fees may apply), or your nearest emergency vet.
Dose guidance
ASPCA/PPH cite toxicosis at >=0.5% body weight (5 g/kg); Merck reports signs at 15-30 g/kg raw onion in dogs. PawPanic uses the more conservative 5 g/kg for RED.
Sources
- Merck Veterinary Manual: Garlic and onion toxicosis
- Pet Poison Helpline: onion
- ASPCA: People Foods to Avoid Feeding Your Pets
Last verified against these sources: 2026-10-13. Where sources disagree, PawPanic uses the more conservative guidance.
Also known as: onions, onion powder, shallot, onion rings, soup mix · Category: Food · Last reviewed 2026-10-14