Does your cat eat litter?

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One of my male cats started eating litter a few days ago. I read that this is very serious. This is what my cat with renal failure did for some months. Tomorrow I will have to take my cat to the vet because he is very sick. He almost stopped eating. He has a fever and I do not have any meds for cat's fever at home. I am very upset because he can die. His eyes are watery. He sleeps all the time and he is very sick.