I have a coworker that has a 4 year old chocokate lab Purebred with papers. He got her to breed with a male dog he had and she was never able to get pregnant. They want to change course and get a golden retreiver to be a house dog. He says she's real smart and fetches great but has never hunted her. Do you think turning a dog this age into a hunting dog would be a big challenge. I would use her to retrieve ducks and geese over land and water. Any opinions would be great .