Golden Retrievers came out of the Scottish Highlands in the 1800s, bred as gun dogs to carry birds back gently over rough ground and cold water. That history explains the dense, water-repellent double coat, the feathered legs and the habit of carrying toys, shoes or anything else to their people.
Many Goldens are warm and eager to please, but they stay puppyish and mouthy for two or three years, and they shed heavily all year with bigger seasonal blowouts. Expect brushing several times a week, daily exercise and training. Cancer risk is higher than average in the breed, so it's worth understanding before you adopt, and older Goldens often make calm, affectionate companions.