Here's what we did, and I'm pretty sure I got this idea from someone on the forum. we bought a big plastic tote and cut a hole in the lid big enough for the cat to fit in. Filled it with kitty litter and put a piece of that non-skid stuff on the lid to catch the litter from her feet as she jumps out. Viola! The dogs cannot get their heads in there, but the cat can easily get in and out.