Alcohol. Drinks and foods containing alcohol can cause serious problems in pets, including vomiting, diarrhea, breathing difficulties, coma, and death.
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Bread dough containing yeast. Yeast dough can rise and cause gas to build up in your cat's digestive system. This can lead to stomach bloating and even twisting, which is a potentially fatal condition.
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Chocolate. Chocolate contains substances called methylxanthines (specifically, theobromine and caffeine) that are toxic to pets and can cause vomiting, diarrhea, tremors, seizures, and death.
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Citrus fruits. Citrus fruits like lemons, limes, oranges, clementines, and grapefruits contain citric acid and essential oils that can cause problems in cats.
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Coconut flesh and coconut water. Fresh coconut milk and flesh can cause digestive issues in pets, though small amounts aren't likely to cause serious harm.
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Dairy. Feeding your cat dairy products can cause digestive problems, since many cats are lactose intolerant and can't process dairy (milk, cheese, yogurt) appropriately.
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Grapes and raisins. While the exact reason why these are poisonous to pets remains unknown, there's evidence that feeding cats (and dogs!) grapes and raisins can lead to kidney failure.
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Nuts. Macadamia nuts are toxic to pets, and like grapes, the exact mechanism of toxicity is unknown. Other types of nuts, including almonds, pecans, and walnuts
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Raw eggs. Raw eggs may be contaminated with Salmonella bacteria. Infection include vomiting, diarrhea, and fever. Raw eggs also contain avidin, an enzyme that hinders cats from absorbing biotin
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