When we got our first Abyssinian, we started keeping our furkids indoors. The two strays who were in our household and had been indoor-outdoor cats weren't crazy about it, but as time went on seemed reconciled. For some years we have had ALL Abys, who have never known any other way. A couple of years ago, a couple of them came out on the patio, then stepped into the back yard, saw all the vast open space and sky...and could'nt get back indoors fast enough! I think, if you have a fairly large space, and/or companion cats, indoors is fine. And it's saved us those awful sleepless nights when the cat doesn't come home to sleep and all you can think of are ornery dogs and speeding cars.