A practical solution for every house with a garden the petsafe staywell dog flap is built into the door or wall the 2 way flap system enables you to decide and set whether your pet can go in and out any time or whether the door stays locked the 2 way flap can be used for entry and exit locked measurements of petsafe staywell 740 total size 352 x 294 mm diameter 281 x 237 mm for maximum shoulder width 219mm for dogs up to a max of 18kg petsafe staywell 760 total size 456 x 386 mm diame