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Does anybody know anything about hereditary liver failure in domestic cats? - liver failure condition_symptoms

7 months. My 4 years. old cat died of liver failure. Today, the death of his sister. It was like deja vu. I can imagine it is a toxin. They have been indoor cats and can not understand that you entered something. The vet has no answer. I need information, or a similar situation may have. I must try to find the answer.