This concept of nothing but obedience training for the first twelve months flys in direct opposition to what I think is the most important aspect of training - balance.
For me the "balanced package" means five factors are in concert from the time a dog reaches what I call the formal training stage (teething is over, mentally mature for his age and physically in shape). This is approximately around 6 months old (or little more). After that training evolves around balancing "the factors" - retrieving, "birdiness", control, focus and responsiveness.
The idea that one is emphasized over any other for any extended period is contrary to maintaining balance (for the way I train my pups).
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Our training philosophies are closer than you realize, Jim. The only difference is temporal -- you begin a balanced approach at 6 months while I don't mind waiting until 12 months. As I see it, waiting an extra few months doesn't jeopardize anything. After all, how do you achieve "control, focus, and responsiveness?" With obedience training, of course.
Kevin B also makes a good point about balance. I think it's sound advice to train for a pup's weakness(es) while tempering her strengths. For example, my current pup is a firebrand. Steadiness and calmness ARE her weaknesses. So, before our evening training sessions I make her sit on her "place" board while I split firewood, cut kindling, and load the mud room. She's not allowed to vocalize, fidget, eat grass, etc. After she's stayed in place for 20 - 30 minutes her reward is a quick, active training session. Obedience adds balance to her high-strung nature.
As to the novice trainers dilemma, I offer this -- books are cheap, the internet is free, and retriever clubs are probably close by. Experience and knowledge make the trainer. Take advantage of all available resources.
I'll end with a humorous fly-fishing quote that I think Tod will enjoy --
“Imagine the permit coming out of a deep-water wreck by the pull of moon and tide, riding the invisible crest of the incoming water, feeding and moving by force of blood, only to run afoul of an asshole from Connecticut.”
-- Thomas McGuane,
Ninety-two in the Shade