Large cats often have problems getting through average sized cat flaps the cat mate large cat flap has been especially designed for larger cats and small dogs with a shoulder height of up to 36cm for example yorkshire terriers pekinese dachshund etc the design of the cat flap means that it can be installed in doors up to 5cm thick the large cat flap has a 4 way locking system to allow in only out only in and out or fully locked positions ideal for when you need to keep your cat indoor