By day 2 they had all used it

A few days ago I took out the old box, and I have had NO problems from any of them. Well one problem but it's more of an annoyance than a problem......one of them is apparently digging for China when they're covering up, so I end up with much litter on the mat but I can easily curl the mat up and dump it straight back into the box. Now if there was only a Litter Robot big enough for my St Bernard, I would be one happy fur parent
