Why?
Garlic is in the same allium family as onion, but its sulfur compounds are more concentrated, so it's considered considerably more toxic. These compounds oxidize red blood cells, which form Heinz bodies and are destroyed by the body, causing hemolytic anemia. Signs often show up a day or several days later, and small repeated doses can be enough.
How much?
No amount is safe. Garlic hides everywhere: sauces, marinades, garlic bread, garlic butter, deli meats, ready meals, broths, and some so-called natural flea remedies, which you should avoid.
The risks
- Hemolytic anemia, sometimes severe
- Pale gums, weakness, rapid breathing
- Dark or reddish urine
- Vomiting, diarrhea, belly pain
- Signs that appear one to several days later
Your cat ate some: what now?
Call your vet or an animal poison control center right away, even if your cat seems fine: the effects on the blood can take several days to appear. Don't make your cat vomit yourself. Tell them whether it was fresh, cooked or powdered garlic, and roughly how much.
Better options
To treat your cat, offer a bit of meat or fish cooked with no seasoning at all. For fleas, ask your vet for a cat-safe treatment.
Common questions
Is garlic good for fleas on cats?
No, and it's dangerous. There's no good evidence that garlic repels fleas, while its toxicity to red blood cells is well established. Use a vet-approved flea treatment.
My cat licked garlic butter, what should I do?
Call your vet and describe how much it ate. Depending on the amount, they'll tell you whether to come in now or monitor your cat, sometimes with a blood test over the next few days.
This information is general and does not replace advice from a veterinarian. If your cat has swallowed something toxic, call your vet or an animal poison control center right away, without waiting for symptoms.