Onions and garlic for cats
Researched & Compiled by the PetAuthority Editorial Team
Clinical Data Sources: ASPCA Animal Poison Control Center & Merck Veterinary Manual
These pages describe clinical possibilities and a Green, Yellow, or Red triage path. They do not diagnose an individual animal or replace an examination by a licensed veterinarian. Read the editorial standards.
Call a poison hotline while you travel
Tap the number for the country you are in. Have the product name and your pet's weight ready.
Can cats eat onions and garlic?
No, cats should not eat onion or garlic, and powdered onion in broth is enough to matter. Red-blood-cell damage can show up as pale gums, fast breathing, or dark urine. Call a veterinarian the same day.
Portion and preparation
None. Cats are sensitive, and powdered onion in broth is enough to matter; there is no safe home portion in ounces (grams), and a smaller pet can be harmed by less than a larger one. Powder, broth, and baked goods count the same as the plain ingredient.
Why this matters chemically
Organosulfur compounds in onions, garlic, chives, and leeks can damage red blood cells in dogs, cats, and many small pets. Raw, cooked, powdered, and broth forms all count, including seasoned leftovers measured in teaspoons (grams). Keep the package where pets cannot reach it.
What clinical signs can appear?
Signs vary with the amount eaten, the animal's weight in pounds (kilograms), and how much time has passed. The list below is what clinics commonly ask about. It is not a checklist that rules disease in or out for one animal.
- Lethargy
- Pale gums
- Fast breathing
- Dark urine
What if this was eaten?
Call a veterinarian the same day and mention onion, garlic, or seasoned table food. Stop the food; save a sample if you can; do not wait for pale gums before you call. Bring the package and the pet's weight in pounds (kilograms) when you call.
Which agencies regulate this advice?
The FDA regulates pet food and animal drugs in the United States. The VMD licenses veterinary medicines in the United Kingdom, where DEFRA also sets animal-health rules, and the APVMA registers veterinary chemical products in Australia. This page is an educational summary, not a product label or a prescription.