Catios: Every year, more than 5 million cats are killed by cars, which is one reason why indoor cats typically live more than three times as long as outdoor cats. These are “catios,” or enclosed “outdoor solutions for indoor cats,” Perfect for small courtyards, balconies, yards. When it comes to creating a safe outdoor enclosure where your cat can explore, your only limited by imagination. Kittywalk Systems and Kritter Kommunity are two companies that these.
Just had a brilliant idea so I googled it and saw some cool photos, not the right design, but shows the idea- outdoor cat enclosure- keeps kitty occupied and keep other critters safe from kitty, PLUS depending on the size you could stick kitties litter box in the enclosure to eliminate smells indoors!