Waterproof and vomit-proof... would those not be Crocs?

Make mine with tight back straps, so I don't get cramps in my feet from squeezing my toes in order to keep my shoes on. Build them up higher on the outside of the sole because I roll my feet outward when I walk.

The cat-activated voice alert system on mine needs to say "CAT IN RANGE". Telling me when she's just coming into range doesn't help, because she can quickly and almost silently get herself into a position where she may be stepped on.

If they would walk themselves over to the litter pan and proceed with automatic scooping and cleaning, that would be grand. If they would walk themselves into the kitchen at oh-dark-thirty and feed her half her breakfast when she's meowing her head off, that would be even better.