We have had issues like that. Come bed time, I, or my daughter goes through the pens and pushes anyone sleeping by a non solid wall (chickn wire) over so they are out of the reach of paws. I've also put boards or other solid surfaces along the edges to help deter.yeah I figured raccoon. I don't know if my dogs would take down a raccoon. I think they would, but they are in the house at night. I haven't had anything mess with the big chickens but I just put the babies outside. I kept them in the run attached to the coop. I just wasn't careful last night. I want to try the lights, but I don't like throwing my money away. LOL