Vegetables · Food guide
Can dogs eat onions?
Onions destroy red blood cells and can cause anemia, whether raw, cooked, dried or powdered.
Not a substitute for advice from your vetUpdated Sep 26, 2026
AI imageDid your dog eat onions?
Call your vet or an emergency vet right away, even if your dog still seems fine. Don't try to make your dog vomit yourself. On the phone, say what your dog ate, how much, when, and how much your dog weighs.
Why onions are toxic to dogs
Why it's dangerous
- The same goes for leeks, shallots, chives and wild garlic
- Hidden in sauces, broth, sausage and baby food
- The effect can build up over several days
Keep an eye on dangerous foods
Kahuno shows you what your dog must not eat
Dogs should never eat onions. If the dangerous ingredient shows up in a food or snack, Kahuno shows the red safety rating the moment you log it, for everyone in the household who feeds the dog.
Frequently asked questions
What should I do if my dog ate onions?
Call your vet or an emergency vet right away, even if your dog still seems fine. Say what your dog ate, how much and when.
How many onions are toxic to dogs?
It depends on the dog, its weight and the amount, and it can't be reliably predicted. That's why the rule is: don't feed it at all.
Other people also wanted to know
All foods
Sources
- FEDIAF Nutritional Guidelines for Complete and Complementary Pet Food for Cats and Dogs, September 2025, Kapitel 7.7.3, Toxicity of onions and garlic in cats & dogs.