just joined this site.and this is a great thread.having the same problem myself.i have 2 indoor cats and 1 outdoor cats.my outdoor cat monica is 8 years old.and due to moving near a busy road.i can no longer let her out.i have been trying to kep her in since xmas,but she is just not happy at all.she cries all the time and follows me everywhere.i dont think she will ever settle down.i am now building a cat run out my back.it was not that exspensive.i just used a old tent frame and some mesh netting.its nearly finished.looks terrible,but i dont care.as long as i can let all 3 of them out for some frsh air