Golden Retrievers are rarely choosy eaters, but require ample (two or more hours a day) exercise. The breed is fond of play but also highly trainable. The muzzle is balanced and well chiseled. The coat is generally lighter in colour than in the American types. As a Golden grows older, its coat can become darker or lighter, along with a noticeable whitening of the fur on and around the muzzle. Puppy coats are usually much lighter than their adult coats, but a puppy with darker ear tips may indicate a darker adult colour.