How do you train a 4 year old cat to use the litter box?

My male cat has been living with me for 3 years. He was living under the house next door homeless when I found him. He was neutered when I found him so he must have had a home before that. Keeping him inside was a nightmare, so he was an indoor/outdoor cat who went outside to use the bathroom -- until this week. He was missing for 8 days, found him trapped under a house, and I'm not going to let him roam anymore. I probably will buy a large outdoor kennel for him to visit outside a couple times a day. BUT he doesn't know how to use the litter box. One week last year, we were snowbound and he didn't go outside for a couple days and he finally just exploded in the litter box. Today, he hasn't been outside and I think he went on the floor. I was gone and it's either stool or he threw a hair ball. Anyway, how do I train an adult cat to use the litter box. I've NEVER had a cat that wasn't just naturally drawn to using the litter box before. THANKS More Info, if it's important: I have another cat. She is 20 years old and has always used the litter box, so we've always had a litter box out in the house. I have put a second litter box out for him now. Also, it is the Breeze litter box system (which I LOVE!) that has pellets and a pad underneath, so it's not typical litter. @Danny: I don' t mean he had a medical "explosion". I meant he held it for two days and then had quite a large stool in the litter box -- begrudgingly. He saw the vet in July. I understand what you mean -- I praise him when he scratches his scratching post instead of my rose-covered wing chairs. lol He never gets punished.



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