No. Cats are even more sensitive than dogs to onions and garlic, which damage red blood cells and cause anaemia. Watch for onion powder in gravy, soup and baby food.

Can Cats Eat Onions? No

If your cat ate onions

Call your vet. Repeated small amounts — for example baby food used to tempt a sick cat — are a common cause.

Call your vet or a 24/7 animal poison line now: ASPCA Animal Poison Control (888) 426-4435 · Pet Poison Helpline (855) 764-7661

What makes it harmful: Sulfur compounds such as N-propyl disulfide
Signs appear: Anaemia typically develops over several days

Symptoms to watch for

Vomiting
Pale gums
Lethargy
Fast breathing
Dark urine

Sources

ASPCA — People Foods to Avoid Feeding Your Pets

General information checked against published veterinary sources. Every cat is different — ask your vet before changing its diet, and call them if it seems unwell.