A raccoon can get through a 2" gap? Seriously? WOW - I had no idea!
I am SO glad I went with hardware cloth on the coop (secured with poultry staples AND screws & washers). I started with 1/4 inch over every single opening, but then was so paranoid that it wouldn't be strong enough that I put a layer of 1/2 inch hardware cloth OVER the 1/4 inch, lol! I'm glad I did, though. The more I read about predators, the more shocked I am at how clever and tough they are!!
OP - so sorry for your poor chickens! When you figure out how the fox got in please update. I'd be just as baffled as you and I definitely want to learn from this as well!! And sorry, but I did giggle at the undies. I've run out there in the middle of the night in my undies too, shrieking like a banshee, and swinging a frying pan like a total nut, lol!
I'm freaking out after watching that raccoon open the garage door! My girls have only been outside for 4 nights and no trouble yet but first thing tomorrow I'll be reinforcing my staples with washers and screws. I have hardware cloth all over and along the bottom edge that is 4 inches longer than the bottom and goes perpendicular to the coop to avoid digging in. Can you show a picture of what your openings look like? Is it over lapping at the openings or just on the doors?
Anyone want to show pictures of extra reinforcements? I don't think I'll be sleeping tonight!