I have all the same thoughts about why I shouldn't have a doggie door. But with KendraE's thread this morning about her yorkie yard..
http://www.yorkietalk.com/forums/gen...-complete.html
I am thinking a bit differently. Only thing I am concerned about is the feral little kitties that are always in my yard. My yorkie yard would need to be completely enclosed, but allowing the sun in, as they do enjoy sun-bathing. I like the idea though...so will be pondering this for awhile.