I want to put an automatic opener on the door, to let them out in the morning. My parents are elderly and my mom has health problems, so sometimes I have to help her in the morning. This makes me late to let the ducks out. I have bought an automatic door for the ducks, and I'm getting the parts to make one for the geese. I'm just trying to determine how big it needs to be for a huge Dewlap Toulouse to go through.