Hi all, We're building a new coop, and I'm considering using rare earth magnets for door closures. They range in strength- options include 10 lbs, 16 lbs, 40 lbs, 70 lbs and > 100 lbs of pull strength. There will only be one door that is close to the ground, otherwise the coop doors and run door handles are elevated about 3-4 feet off the ground. There will be a backup system with a piece of wood that turns to physically block the doors from opening. So how strong do you think raccoons are??? I'm very curious to know. A google search revealed one raccoon that dragged a 40 lb bag of dog food across a yard... Thanks!