It's all personal preference if you want the dog to deliver to hand. Myself, I want the dog to heal and hold the duck until I reach down and tell her to release it. My buddy, on the other hand, just cares that it makes it back inside the boat or blind.
Pick up a training book like 10 Minute Retriever or Water Dog and they'll explain how to train hold.
Pick up a training book like 10 Minute Retriever or Water Dog and they'll explain how to train hold.