Verdict
Never feed
Key concern
N-propyl disulfide
Species
🐶 Dogs
Why this verdict for dogs
Onions damage red blood cells and can cause anemia. All forms — raw, cooked, powdered — are toxic.
Warning signs to watch for
- Weakness & lethargy
- Pale gums
- Reddish urine
⚠ If your dog ate onion
Act immediately — don't wait for symptoms.
- Call your vet or a pet poison helpline right away.
- Note how much was eaten and when.
- Do not induce vomiting unless a professional tells you to.
🛡️
Poisoning emergencies are expensive
A single toxicity visit can cost hundreds. Compare pet insurance plans that cover accidents and poisoning.
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Frequently asked questions
Can dogs eat onion?
No. Onions damage red blood cells and can cause anemia. All forms — raw, cooked, powdered — are toxic.
How much onion can dogs have?
None — onion is not safe for dogs and should be avoided entirely. When in doubt, ask your vet.
Is onion safe for cats too?
Verdicts can differ between species. See the cat answer for onion →
Related foods
By the CanMyPet Editorial Team · Reviewed against ASPCA Animal Poison Control, the American Kennel Club (AKC) and Pet Poison Helpline · Last updated June 2026.
Sources
- ASPCA — People Foods to Avoid Feeding Your Pets
- American Kennel Club — Dog Nutrition
- Pet Poison Helpline — Poison List
CanMyPet provides general information reviewed against trusted sources (ASPCA, AKC, Pet Poison Helpline). It is not a substitute for professional veterinary advice. When in doubt, always contact your veterinarian.