I was looking for this exact post today...thank goodness it's here!
My cat Nico, about five months old, also has started darting out the door whenever I can't (or forget to) block him. I am soooo frustrated with him!
But last night was the last straw...it's 1:30 am, pouring down rain outside, and when my boyfriend got home with some friends, Nico decided to run out the door. He's found that we can't reach him under the porch, so that's the first place he runs. We try toys (Da Bird, which he flips out for when it's playtime), treats, and scaring him out, but nothing will lure him back inside. Finally, my boyfriend brought out a hammer and tore off the lattice work under the porch and crawled under to get him. He knows he's in trouble today, because I wouldn't curl up with him last night or give him any special attention this morning, but I'm sure he will only be remorseful for a little while before he starts it all over again.
There are other stray cats out there that we feed regularly, so I'm wondering if this is because he has the urge to mate. Will neutering help? I was going to wait until he was six months, but at this point, I'm willing to try anything. Please help!
P.S. I have another cat in the house, and they are best buddies. My other cat, who is a neutered male, has never once tried to run out the door. He's too content with watching the world from the window. We picked him up off the streets, so I think he remembers what it's like to be on the outside and doesn't really miss it.