my boys are inside cats, i agree w/catsnclay that if they share your bed and indoors it is wise to limit exactly what they bring there.....the boys have a lovely screened porch with a lovely cat tree which they all dearly love. i think a screened outdoor run would be nice for them when i can be outdoors w/them. i keep many windows open for them to "sniff" at and can often find them there napping on a table/bench by the window.