My Dixie - a Golden Retriever is a trained hunter. I was the one who trained her but dad is the one who takes her duck and goose hunting. As soon as she sees him getting ready to go she get soooooo excited she can barely contain herself. We are starting out our puppy in hunting too.

Both dogs are 100% spoiled lovingly house dogs. It does not effect how they hunt. If anything it probably helps because of the wanting to please attitude that comes from you loving them and them loving you. The communication of knowing what you want from them also is enhanced.

In short - hog wash to the theory they have to stay outside. Maybe the owners should stay outside and the dogs inside. Then they might not be so stupid to think this takes away a dogs natural ability to do what it was bred for.