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6. Garlic

"Onions and garlic belong to the genus Allium. These plants share a common toxic mechanism whereby they cause oxidative injury to cells — in particular, red blood cells. The sulfhydryl groups in hemoglobin are oxidized by sulfoxides that are present in all parts of the plant and bulbs.

"Cats have about twice as many sulfhydryl groups per hemoglobin molecule than dogs and other species, making them particularly sensitive to oxidative injury from Allium plants. Even a one-time small amount of garlic is enough to impair their ability to transport oxygen to tissues, causing injury to red blood cells that can last for months. In essence, it is a form of anemia in cats. If chronically exposed even to very low amounts over a long period of time, most cats will suffer signs of anemia."

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