The Large Cat Door (White) Outer Size: 9.8" x 11" x 2.15"(W x H x D) Inner size: 7.9" x 8.7"(W x H) Cut-Out Size: 8.3" x 9.5" (W x H) It's suitable for cat & doggie lighter than 25.54 lb and waist circumference shorter than 24.8". Please make sure your pet's waist first, thanks. Note: 1). Make sure that the width and height(shoulder level) of the pet are inferior to the pet screen door, thanks. 2). The depth of door/wall/window you are going to install to had better more than the depth 2.17", so as to screw in 8 screws from both sides easily. 3). If the cat door is too thick for the door, please use scissors or cutting machine to cut along the line in the width of the frame.