Dogs with Sable colouring are born with either chocolate or black coats. A pup will shed its chocolate coat, growing in an adult coat of gold or silver/gold with brown tips on ears, beard/mustache, tail or feet. A pup born with a black coat will grow in a silver adult coat with black tips.
K locus alleles determine the colouring pattern of a dog's coat. Sable dogs carry ky/ky