Thanks @RavynFallen
, I should have mentioned, their breathing is fine. (Until they die.) The pen is literally very open. One side is chain link fence. I have pallets all around the other sides and the top is a bird netting. They have plenty of cover to go under boards as well as a dog house but do not go under cover for whatever reason.....birdbrains!
Sometimes you don't hear it in the lungs, usually yes, but known to happen... could be hypothermia from being too wet for too long...
I would put a pallet over the wet spot.... And figure out why they hate their coop... Maybe start feeding them treats inside the coop....
If I couldn't figure out how to get them to spend more time in the coop and out of the rain I would put a rain shelter where they hang out... Giant picnic umbrella, a table, a piece of plywood leaned up against a chair... Whatever... Rain shelter.
x2
Sometimes though they will still just stay in the rain...