We have a 14 year old cat that is not sick or anything. She has begun pooping indoors, in the computer room now that it has gotten hot. She did this last summer, and as soon as it gets cool, or cools down outside, will go back outside to do her business. (All our cats are doggie door trained, none have a litter box, none are litter box trained.) We have tried everything to stop it, nothing works. We clean it up, we spray different things that have been suggested and still she does it. What can we do? Like I said, it's only when it gets hot (It gets very hot and humid where we live).