What Should I Do If My Cat Ate A Small Amount Of Onion?


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Onions and other plants of the Allium family can cause illness in cats even in small amounts.  Signs can be noted at 5 grams per kilogram of body weight.  The onion causes damage to the red blood cells leading to anemia.  Signs include weakness, vomiting, decreased mucous membrane color, and a change in the urine color. 
If your cat ate any other unusual food this could be gastrointestinal upset due to dietary indiscretion.
Have your cat examined by a veterinarian--they will run blood tests to check the red blood cells and other important organs (liver and kidney especially).

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