Please, cat lovers, build this "catio" and keep your cats away from my property. Leash laws for dogs but your cat(s) can destroy and pollute my yard and threaten and tease my dog? Also a good idea to keep you away from cats!
Spiral Cat Trees/Stairs - Real Cabinet-Grade Pine, handmade in USA
Cat shelves or cat walls? No matter what you call them they are the coolest diy cat idea I've ever seen. Cat climbing shelves are a great way to make something cool for you cats & save space in your home.
Cat door in the wall to your garage - litter box on the garage side. No more stinky litter box in the house! * not so sure it would work smell wise as afterall the entrance is in the house. Pretty neat though so the tray isn't an eyesore in the house.