I have a similar problem, my guys lay on the floor on their backs and open the bottom drawer and then crawl up the back to the 1st and 2nd drawer. The drawer unit is self contained so they can't go into the other cabinets or the walls. They have basically taken over those drawers so my "stuff" is in a basket on the counter. I had the same problem with them getting on the counter, which I didn't mind but they started going potty up there too and that's when it had to stop. So the top 2 drawers I put childproof latches, the cheap ones that are long with a pointed tip. I did the top two drawers because the little monsters used the second drawer to jump up to the counter too.....little Marines I tell you. They can hurl themselves over the average barriers. I would be worried though about the register, can you cover it with wire, not chicken wire but something that has smaller holes. As your ferret grows it may get stuck and injure herself and it sounds like just open territory under there. You never know what holes are there she could travel to or get stuck in.. Kim the Oregon one Kim Reyes Residential Specialist John L. Scott Real Estate Direct: (503) 380-4195 Toll Free 1-877-490-2595 http://www.kimreyes.com [log in to unmask] [Posted in FML issue 3846]