Staywell 737 Cat Small Dog Pet Door Flap Lockable Grey Information Small pet door - grey - With see through flap For cats up to 7kg (15 Ibs) and small dogs. With see through flap. Dimensions Overall size: 236mm x 198mm Cut out size: 185mm x 158mm Pet Max shoulder width: 147mm Overview Suitable for cats & small dogs - Security Barrier - Locking Fits Doors - Wooden, PVC, uPVC & Metal, Walls