The chocolate Labrador emerged in the late 1800s, with liver colored pups documented at the Buccleuch kennels in 1892. The first dog to appear on the cover of Life Magazine was a black Labrador Retriever called 'Blind of Arden' in the December, 12th, 1938 issue. Labrador colouration is controlled by multiple genes. Less common pigmentations (other than pink) are a fault, not a disqualification, and hence such dogs are still permitted to be shown.The intensity of black pigment on yellow Labradors is controlled by a separate gene independent of the fur colouring. Yellow Labradors usually have black noses, which may gradually turn pink with age (called 'snow nose' or 'winter nose'). This is due to a reduction in the enzyme tyrosinase which indirectly controls the production of melanin, a dark colouring. True Dudleys are extremely rare. In 2014, the UK breed survey reported an average lifespan for the Labrador Retriever of 12 years and 3 months, with some living up to 19 years of age.
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