The Clevercat top-entry litterbox is perfect for those households that have both a cat and a dog. The lid on top prevents the dog from accessing the "snack bar" while the hole in the lid allows the cat to get inside and do its business and with total privacy. I've got a new Clevercat that's never been used that I'm giving away for free. Full disclosure: our cat never used it. We put litter in it once, but the cat didn't take a shine to it. That being said, our previous cat had his own Clevercat that he used all the time, and it prevented our dog from eating the contents (yuck :sickhold. So, if you want a super cool litterbox that remains unsoiled by any feline, just send me a PM. BTW, this thing retails for $35, but the first person who contacts me will get it for free.