Please solve my argument with my DH and me!! LOL I think between 8"x8" or 10"x 8" would be a plenty big enough door. He's not too bright and thinks that it needs to be much bigger, like 1.5'x1.5. Please tell me I'm right!!! My biggest bird is an Australorp, if that helps. I'm trying to keep my nosy little goats out of the chicken coop.