Hey Moraff:
My cat's the same way: I have photos of him sitting on top of everything I've built (and inside some of them). it's almost like he's inspecting it before it goes out and makes sure it is "pussy approved".
I did some MDF kitchen cabinets for a customer once and he wanted them black on the outside, white inside. Only problem was my cat would inspect them before the paint was dry and for a time, I had black foot prints on the white paint, then I'd touch them up and have white foot prints on the black.
Eventually I locked him up but left some just as a signature. I even thought about having that as my logo and putting them on some discrete area lol....