Golden Retrievers were developed in the Scottish Highlands in the 1800s as gun dogs that retrieved birds from land and water. That history explains the water-repellent double coat, the feathered legs and the habit of carrying things around in their mouths. They mature slowly, so expect a bouncy, mouthy dog for two or three years.
In Sacramento, the coat is the main thing to plan around. Goldens shed heavily all year and blow their coats seasonally, and the dense undercoat holds heat through the long dry summers. Most are warm, eager to please and easy to train with rewards, though dogs vary, and an adult Golden may arrive with habits of its own. Cancer and joint problems are well documented in the breed, so it helps to understand them before you adopt.