The Yorkshire Terrier is a tan dog with a blue saddle.
Particolours exist, although they are not correct for the breed standard.
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.
The AKC registration form for Yorkshire Terriers allows for four choices: blue and tan, blue and gold, black and tan, black and gold.
Colour alone will not affect whether or not a dog is a good companion and pet.
Even though off-coloured Yorkshire Terriers are advertised at premium prices, being of an unusual or atypical colour is stated to be neither new, desirable, nor exotic.

Until recently, mismatched Yorkshire Terriers could be crossed with Biewer Terriers, a new breed that originated in Germany from particoloured Yorkshire Terriers.
Although the AKC will not deny registration of a Yorkshire Terrier on colour alone, meaning that particolours are now registerable with the AKC, the Yorkshire Terrier Club of America has a directive that "any solid colour or combination of colours other than black and tan" for adult dogs is a disqualification, and "dogs of solid colour, unusual combination of colours, and particolours should be disqualified."
The Yorkshire Terrier is a tan dog with a blue saddle. Particolours exist, although they are not correct for the breed standard. 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. The AKC registration form for Yorkshire Terriers allows for four choices: blue and tan, blue and gold, black and tan, black and gold. Colour alone will not affect whether or not a dog is a good companion and pet. Even though off-coloured Yorkshire Terriers are advertised at premium prices, being of an unusual or atypical colour is stated to be neither new, desirable, nor exotic.
Until recently, mismatched Yorkshire Terriers could be crossed with Biewer Terriers, a new breed that originated in Germany from particoloured Yorkshire Terriers. Although the AKC will not deny registration of a Yorkshire Terrier on colour alone, meaning that particolours are now registerable with the AKC, the Yorkshire Terrier Club of America has a directive that "any solid colour or combination of colours other than black and tan" for adult dogs is a disqualification, and "dogs of solid colour, unusual combination of colours, and particolours should be disqualified."
Yorkshire Terrier