ALHAMBRA, Calif -- The littermates of a Northern California puppy may be green with envy.That's because a golden retriever born last week is green. The little green fella is one of a litter of four. But his littermates are the usual blond color.The owner, a dog breeder, says he's mystified about the green color.Veterinarians said that it's possible for a newborn pup's fur to be green because the placenta, which is green, sometimes rubs off during birth. Whatever the cause, the little green guy now has name -- Wasabi. That's the spicy green mustard put on sushi.