The Yorkshire Terrier is one of the smallest dog breed of terrier type, and of any dog breed. The particolour coat is white with black-blue and tan. The white is caused by the recessive piebald gene. It is very rare to get a particolour, and if one is found, it tends to be very expensive. Some Yorkshire Terriers are solid golden, they only produce pheomelanin, others are liver or chocolate, a brown colour; they produce brown eumelanin instead of black eumelanin. The standard prescribes clearly defined fur-colors, and non-standard colours may indicate crossbreeding with other breeds or in rare cases even health problems.
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