Suspect poisoning? US: ASPCA Poison Control (888) 426-4435 · UK: 01202 509 000 · Severe symptoms → nearest emergency vet now.

Which is worse for cats — a speck of garlic powder or a small piece of raw onion?

Cats · Food safety

Last reviewed: 2026-09-05 · Reference ranges: ASPCA, Pet Poison Helpline & Merck Veterinary Manual

Short answer

Garlic powder is 5 times more toxic than onion by weight. Both damage red blood cells, but concentrated garlic products are far more dangerous. Even 1/8 teaspoon of garlic powder could harm a 10-pound cat. If ingested, call ASPCA Poison Control (888-426-4435) immediately — symptoms like weakness or pale gums may take 3-5 days to appear.

Garlic — Food safety facts

Do not feed · Cats · full breakdown on the linked food page

Toxic. Damages red blood cells (hemolytic anemia), often days later. Powdered garlic is concentrated — worse by weight.

Dogs and cats carry the same rating (Do not feed), so the notes below hold for either pet.

Garlic should not be given to cats at all. Even a small amount can do harm, so there is no portion small enough to be safe.

Do not induce vomiting and do not give milk or oil to “dilute” it. Note the food and roughly how much was eaten, then call your vet or a pet poison hotline and follow their advice on whether to bring the pet in straight away.

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.

The full verdict, portion guidance and serving notes are collected on the Garlic food facts page.

Open the full food page: Garlic food facts →