well, not a worry syndrome to me until that incident where shaddow went missing after a guy came in when I wasn't home! well, before that, with 13 cats and you can't hear, it just becomes a habit!

I can't hear them crying if stuck behind refrigator/stove, in closets/cabinets or bedcats who think frightenly that s/he can't find way out under king-size blankets so I check frequently. even though my doggie, he would often alert me when one of them is crying. sometimes it's hard to tell if he was trying to tell me when I'm on way out or in, he gets too excited!

for going out, I usually have my eyes down behind me (facing the room, not outside) before I open the door, squeeze backwards without blinking through it if any comes close and shut quickly. the same for going in.

extra work with my furtravelers, they're more naughty when we're at other houses, since they are at new house, they curiously explore & go anywhere, in any directions (even into ceilings) than knowing a way to escape. at home, the very same door you get out in and after many times you say "no no no!" they knew where, when and would attemp! anyway, there, I headcount extra, at bedtime and after I get up, not just when I go out and in because you don't know their house very well. for me, better late than sorry!

thank god they all are one big ark, (and most are followers) so they all often cuddle together, stay in a pack or at least all in one same room so that made my headcountings faster. I headcount the cats in order I got them so I won't get lost my count. poor you, you only have two and this already is a big worry for you!