Cat Door - The Original Cathole Interior Pet Door - The Only Cat Door With A Cleaning / Grooming Brush. 100% MADE IN USA ! Cathole Door Separates Your Cat's Litter Box From Your Living Space. Quick and Easy "Do It Yourself" Installation - Takes Approximately 30 Minutes. Keep Your Children and Dogs Away From The Litter Box While Still Giving Your Cat Easy Access. Removable Brush Helps Groom Your Cat and Keep Your House Clean.