What to do if your pet ate it
Contact your vet or a poison line right away, report how much Onion powder was eaten and your pet's weight, and keep any packaging or leftovers. Do not induce vomiting unless your vet tells you to.
Signs to watch for
- Vomiting and diarrhoea
- Lethargy and weakness
- Loss of appetite
- Severe: tremors, breathing trouble, collapse
If your pet shows vomiting, lethargy or any unusual behaviour after eating Onion powder, go to the nearest emergency vet immediately.
Dogs and cats carry the same rating (Do not feed), so the notes below hold for either pet.
Other foods that are toxic or dangerous
The full A–Z food list groups every food by verdict for each species.
Why these cautions matter
Garlic and onion damage a pet's red blood cells and can bring on anaemia. Signs are often delayed for several days, so looking fine straight afterwards does not rule it out.
Frequently asked questions
Can cats eat Onion powder?
NO — do not feed. Concentrated onion, and it hides in stock cubes, gravy and baby food.
What if my cat already ate Onion powder?
Call your vet or a poison line now with the amount of Onion powder eaten and your cat's weight, and do not induce vomiting unless a vet tells you to. If Onion powder was eaten and you then see vomiting, lethargy, tremors or breathing changes, go straight to the nearest emergency clinic.
Is there a safe amount of Onion powder for cats?
There is no accepted safe dose of Onion powder for cats; it is classed as toxic or dangerous, and reactions vary with the individual animal, so it is not something to feed at any amount.
How often can cats have Onion powder?
Onion powder is not something to feed at any interval; it stays off the menu entirely.
What are safer treats than Onion powder for cats?
Pick from the safe list instead — Sweetcorn kernels or Endive carry none of the risk that Onion powder does, and they work better as an everyday treat.