Garlic, onions, leeks, and chives contain sulfoxides and disulfides, which can damage red blood cells and cause anemia in both dogs and cats. Cats are especially more sensitive to the effects of garlic and onions.

Source: Dr. Justine Lee

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The data represented on this page represents common agreed upon levels of toxicity by the internet community. While it may be factual, you should always check with your veterinarian in the case of a suspected ingestion.