It's only 10wide by 17 high, but I have seen my full grown Embden Gander go through it, but mostly they use the big door, the pop door is mainly for the chickens and ducks since we have nesting boxes in this house too. You diff want to go bigger than 10X17 since your geese will be using it for their main entrance, but they will duck and not mind honest.Yeah, it did!!What size is your goose door?