Goldens are the kind of dog everyone loves, but they come with some health baggage. Cancer rates in this breed are frustratingly high. Some studies put it at nearly 60% of Goldens. Diet alone won't prevent cancer, but foods with antioxidants and omega-3s give their immune system a better shot.
They're big dogs that stay active well into middle age, so they need decent protein to hold onto muscle. You've also got to watch the calorie count because a chunky Golden puts extra stress on already vulnerable joints.
That coat needs omega fatty acids. If you notice dull fur or heavier shedding than usual, try a fish-based food or add a fish oil supplement. You'll see a real difference within a few weeks.