My Brittany Spaniel is proud of her ability to get in and out of the pop door. I raise Buff Orpingtons and some Guineas. I started out with a 12"W x 16'H guillotine-type door. She hardly had to duck her head to get in. I put a piece of cattle panel over the door so the opening is 6"W x 12"H. I don't know how she collapses her bones, but she can walk through that too. If I make it any narrower the rooster and the guineas won't be able to fit through. I think if I put a baffle over it she might not be able to get in, but I have no idea what shape or size it needs to be. Advice?
See culprit below.
See culprit below.