On one of the farms in which I hunt in Iowa, the owner restricts access to a few people. One of them had permission to hunt himself, but brought a few friends one day. He reported to her that they'd hunted, and lost something like 5 birds. That ended his permission to hunt.

A good dog can make a poor shot look a lot better, but I hate to rely on the dogs to that extent. I do most of my hunting with people who shoot reasonably well, and who know enough not to shoot when it's too long a chance for them to be very likely to kill it.