We had a large storage house constructed with only one front door. At first, mama cat got caught in there for almost 1 -1/2 day before I saw her in the window crying to get out. Again, Motley Cat (rb) got herself in there and stayed almost a full 24 hour day before I got her out of there. Needless to say, now when any of us, and especially myself, opens the front door, no furkids venture in the place. ( I have been thinking about making an exit-only door for the building so my furkids can get out but cannot get in.)

.............. wayne