Garlic

Garlic is a staple in every kitchen, but it acts as a potent toxin for cats. It destroys red blood cells the same way onion does, only more concentrated — so it's actually more dangerous — and even small amounts eaten repeatedly add up in the body.

The three alliums

Garlic belongs to the Allium genus along with onion and chives. All three carry sulfur compounds like allicin and thiosulfate that oxidatively damage a cat's red blood cells and cause anemia, so the nature of the risk is identical. None of them should ever be given to a cat.

How cats get exposed

It's not just whole cloves — minced garlic, roasted garlic, garlic juice, and garlic powder are all dangerous. In practice the most common exposure is sharing a bite of human food, so never offer dishes or sauces made with garlic. Keep garlic and seasoning jars on the counter stored away in a cabinet your cat can't reach.

How symptoms progress

Stomach signs like vomiting or diarrhea may appear first, within a few hours. The dangerous part — anemia — emerges gradually over days. Pale gums, lethargy, rapid breathing, or reddish urine are signs that red blood cells are being destroyed. Because these appear late, a cat often looks fine at the time of exposure.

What to do right now

If you suspect ingestion, go to the vet without waiting, even with no symptoms. Anemia shows up late, so looking fine now does not mean safe. Knowing what and how much was eaten is a decisive clue for the diagnosis, so tell the vet.