I've been looking for a magnetic or infared activated cat door, that
operates the opposite of the standard ie. the cat wears a collar that
locks the door. We have an elderly cat we do not want to let out
unless we are around. The rest of the cats can come and go as they
please. None of the younger cats will tolerate or keep a collar on
more than a day. We currently have a standard cat flap door that all
use. Has anyone seen such an animal??

thanks
..rick..