My wife and I live in a 3-level townhome. We have a cat and two dogs. The cat has run of the house- and in fact needs to have access to the 3rd floor. However the dogs should not be up there! My challenge: take a baby gate that we already own, and make a cat flap so the cat can go up and down the stairs without letting the dogs through.
We already had the extra-tall walk-thru baby gate
that you can get at Babies 'R' Us. We had it at our old home, where we used it for the same purpose - but there, the cat was able to get around the gate by going through the railing bars. Here in our new home, the bars are too close together, and the cat can't fit through.