Well, I'm allergic, so I don't keep them in the house, and never cared for them anyways (I'm definitely a dog person). Unfortunately, as you well know having had cats, they're sneaky creatures. No matter how hard you try, you leave a door open for half a second, they'll sneak in. And having any garage door with opener gives a cat PLENTY of time to sneak in. Let alone if you're working in and out of the garage. I've cat proofed quite a few of my rooms in my garage/shop. They still get in somehow. Thankfully, there's very little human smells in those areas (since my fishing room is seperate from the garage), so all they have is mechanical smells from saws, drills, etc. Hmmmmmm, wonder if that would work with cats? Hell, I know my dogs will always mark over what I just "marked" out in the wild. LOL.