We really had hoped that the dogs and the cats could reach some sort of detente. So many people told us, "Oh, they'll work things out!" But at least one friend reassured us from bitter (and deadly) experience that they don't always.
So here's how the animals spend much of the day. The dogs watch cat TV and the cats watch dog TV.
I'm now talking to woodworkers to get a permanent, attractive gate built at the bottom of the stairs so we don't have to step over something every frigging time we go up or down.
On the bright side, it confines the cat hair to the upstairs, so people with allergies can still come visit.