I have only one who goes out, and he is a male who is so
bull-minded it's impossible to argue him out of it. I have
resigned myself to facing the day when he doesn't come
home again, as it's bound to happen here. I do love him,
but I just can't keep him in.
Now that I've gotten my sniffling out of the way (sorry),
Ajax and I have a routine. He bolts out the first time the
door is opened in the morning and returns for dinner at
dusk when the coyotes come out. He and his sisters
are served wet food ONLY at that time, so he's pretty
reliable about showing up for goodies. After that, all of
the howling in the world will not open that door again
until the sun is up.
Good luck with setting a routine in your home that is
acceptable to both you and your cats