This outdoor run gives pets ideal protection from birds of prey and cats as well as having a completely removable roof the run is made of glazed pine the top fixes securely to the run with included clamps and folds open on both sides the trixie natura pet run can be used on its own or as an extension two side doors enable you to join two runs together or link one up with a hutch or simply combine two runs with opened doors to give your pets twice the space bar spacing 10 x 23 cm h x w