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Hello. Thanks for writing in. My name is***** and I would be happy to help you. Eating tuna is not bad for them, but it shouldn't be a big portion of their diet. Tuna is deficient in taurine. Cats who have a taurine deficiency tend to develop heart problems. It can be given in small amounts but should not be a major part of their diet. Use it more as a weekly treat. Please let me know if you have any other questions or concerns. Hope this helps.
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