A Little Yorkie Color History
Yorkies Come in More Colors Than You May Think
Some colors and patterns seen in Yorkies have long histories within established bloodlines, while others raise questions about their origins. Solid black and merle are two examples that deserve a closer look. Modern DNA testing can identify many of the genes responsible for coat color and pattern, but identifying a color gene is not the same thing as proving when, where, or through which ancestry that gene entered a bloodline.
NOTE: AKC itself notes that its DNA profiling is used for genetic identity and parentage and does not determine whether a dog is purebred.
Yorkshire Terrier History
From Working Terrier to Yorkshire Terrier
Huddersfield Ben and Katie, early Yorkshire Terriers
Huddersfield Ben (1865–1871) became one of the most influential dogs in the development of the modern Yorkshire Terrier.
The Yorkshire Terrier we know today developed in northern England during the 1800s. During the Industrial Revolution, Scottish textile workers migrated into Yorkshire and brought small terriers with them. These dogs were bred with other local terrier types and were valued as determined little working dogs, including for controlling rats and other vermin around mills and homes.
Early Yorkies were not yet the tiny, uniform dogs we recognize today. They varied more in size and appearance and were known by names such as the Broken-Haired Scotch Terrier and Toy Terrier. As breeders began selecting for a smaller dog with a long, silky coat, the Yorkshire Terrier gradually took on its more familiar appearance.
By the 1870s, the name Yorkshire Terrier had come into use. One particularly influential dog, Huddersfield Ben, born in 1865, became an important foundation sire in the development of the modern breed. Over time, the tough little working terrier became equally prized as a show dog and companion.
The Traditional Yorkie Coat
From Black & Tan Puppy to the Adult Coat
Yorkshire Terrier puppies are typically born with a black and tan coat. As they mature, the dark coat may gradually lighten and develop the steel-blue coloring associated with the traditional adult Yorkshire Terrier. However, the degree of color change can vary from dog to dog, and some Yorkies retain a very dark or nearly black coat as adults. The tan markings may also deepen into a richer golden shade with maturity. Because coat color can continue developing over time, an adult Yorkie may look quite different from—or surprisingly similar to—the way it looked as a puppy.
Why Yorkie Colors Can Look So Different
Coat color is controlled by several different genes working together. These genes influence which pigments a Yorkie produces, where those pigments appear on the coat, and how they may change as the dog matures. This is why Yorkies can display variations such as parti, chocolate, gold, and other colors and patterns while still sharing many of the physical characteristics associated with the breed.
The Parti Yorkie
A Recessive Pattern With an Interesting History
Parti Yorkshire Terriers have a white coat pattern combined with areas of black or blue and tan or gold. Although the parti pattern may look very different from the traditional Yorkshire Terrier coat, the gene responsible for the white spotting can be carried unnoticed for generations when a dog inherits only one copy. When two carriers are bred together, parti-patterned puppies can appear in a litter, which helps explain how the pattern can seemingly appear unexpectedly within established Yorkie bloodlines.
The parti pattern is especially important to the Yorkie color story because it shows that a recessive color gene can exist within a bloodline without being visible in every generation. Modern DNA testing can identify the genetic variants associated with this pattern, giving breeders information that earlier generations simply did not have.
Historical Note: The modern parti and tricolor Yorkie story became especially visible in the 1980s, when Yorkshire Terrier breeders Werner and Gertrud Biewer began producing tricolor puppies in Germany. Those dogs eventually developed into the separately recognized Biewer Terrier. The existence of a recessive white-spotting gene helps explain how a pattern can remain hidden in carriers and appear when the right genetic combination comes together
Understanding the Gold Coat
The Gold & Golddust Yorkies
Gold has always been part of the Yorkshire Terrier color palette. In the traditional adult coat, the head, chest and legs develop rich golden or tan coloring while the body typically develops the familiar dark steel-blue coat. Some Yorkies, however, develop much more extensive golden coloring, ranging from pale cream-gold to deeper honey, copper or reddish shades.
Coat color is influenced by several genes that control which pigments are produced, where they appear and how intense they become. Genetic variants affecting red and yellow pigment can contribute to predominantly golden coats, but appearance alone does not identify the exact genetic combination. DNA testing can help determine which coat-color variants an individual dog carries.
Historical Note: Gold itself is not a newly introduced color in the Yorkshire Terrier—the breed standard specifically describes rich golden tan as part of the traditional coat. What differs in predominantly or solid-gold Yorkies is the distribution of that coloring, rather than the existence of golden pigment itself. The traditional standard calls for a blue-and-tan adult coat, so an extensively gold or solid-gold Yorkie falls outside that standard appearance.
A Lighter Expression of the
Golddust Coat
Golddust is a name commonly used for Yorkies whose coats mature into very pale gold, cream, ivory or champagne-like shades. Visually, they fall within the same general red-and-yellow pigment family as other predominantly gold Yorkies, but the name describes the appearance rather than proving a specific genetic formula. The exact shade can be influenced by multiple coat-color and intensity genes, so DNA testing is needed if a breeder wants to know which variants an individual dog actually carries.
Chocolate & Chocolate Parti Yorkies
Genetics & Standard Note:Chocolate is produced by recessive brown-pigment genetics, which means the trait can be carried without being visible and may appear when two compatible carriers are bred. Chocolate and Chocolate Parti fall outside the traditional Yorkshire Terrier show-standard colors. Modern DNA testing can identify many of the variants responsible for brown pigmentation and white spotting, but it cannot by itself establish when or how those variants first entered a particular Yorkie bloodline.
From Puppyhood to Adulthood
Chocolate Parti Yorkie combines chocolate pigmentation with the white spotting pattern commonly called parti. The chocolate genetics change dark eumelanin to brown, while separate white-spotting genetics create the areas of white throughout the coat. Because these traits are controlled separately, Chocolate Parti Yorkies can vary greatly in how much chocolate and white they display and where those markings appear.
As puppies mature, coat length, texture and shade can change, making their markings appear softer or more defined over time. Penelope is a beautiful example of how the rich chocolate, bright white and warm facial coloring of a Chocolate Parti can remain distinctive from puppyhood into adulthood. White spotting in dogs is genetically complex; UC Davis identifies MITF-associated piebald/parti testing and specifically notes that the amount and placement of white can vary.
The Biro Parti Yorkie
Historical Note: Biro is a newer name in the Yorkie color story, with breeder histories tracing its early development to Germany in the early 2000s. The first registered Biro Yorkshire Terrier is generally reported to have been a chocolate, white and gold female born from Biewer lines, followed soon after by other similarly colored puppies. As breeders continued working with the color, the name “Biro” came into use and is said to have been created from the names of two breeders involved in its early development. Today, Biro is used by some breeders and registries to describe this distinctive chocolate, white and gold variety. It is not an AKC-recognized Yorkshire Terrier color and is not recognized by AKC as a separate breed.
Chocolate Parti
Historical Note: Chocolate and Chocolate Parti are outside the traditional Yorkshire Terrier show-standard colors. The AKC standard centers on the familiar blue-and-tan adult coat, and AKC judging guidance specifically identifies solid chocolate, chocolate-and-tan and parti-colored Yorkies as nonstandard colors. Because chocolate is recessive, the brown gene can be carried by dogs that do not visibly appear chocolate and may be expressed when two compatible carriers are bred.
Understanding the Chocolate Coat
Chocolate Yorkies carry recessive genetic variants that change eumelanin—the pigment that would normally appear black—into shades of brown. The best-known chocolate variants occur at the B locus in the TYRP1 gene. A dog generally needs to inherit a recessive brown variant from both parents for the chocolate color to be expressed, which means the gene can be carried without being visible in every generation.
Chocolate affects the dark pigment of the coat as well as pigmented areas such as the nose and foot pads, giving chocolate Yorkies their characteristic brown pigmentation. It does not turn red or yellow pigment brown, so tan and golden markings are controlled separately and may still appear alongside the chocolate areas.
Understanding the Biro Parti Coat
Biro Parti is a name commonly used for Yorkies displaying a tricolor combination of chocolate, white and gold or tan. The chocolate pigmentation replaces the black pigment that would otherwise appear in the coat, nose and other pigmented areas, while the parti pattern produces the areas of white. The warm gold or tan markings are controlled separately, giving the Biro its characteristic three-color appearance.
Although a Biro may look similar to a Chocolate Parti, the term Biro is generally used when the characteristic chocolate, white and gold combination is present. As with other color descriptions, appearance alone does not identify every genetic variant a dog carries, and terminology can vary somewhat among breeders and registries.
Biro From Puppyhood to Adulthood
Pictured is a beautiful example of how the Biro pattern can develop with maturity. Her chocolate pigmentation, bright white coat and warm golden markings were visible when she was young and became increasingly distinct as her adult coat developed. While coat length, texture and shade may change as a Yorkie matures, the underlying distribution of chocolate, white and gold gives the Biro its recognizable appearance.
Merle Yorkies & Their Color Variations
Merle is a distinctive coat pattern caused by a variant in the PMEL gene. Rather than creating one specific coat color, merle alters areas of eumelanin—the pigment responsible for black and brown coloring—producing irregular areas of lighter, mottled or marbled pigmentation. Because the pattern develops differently in every dog, no two merle coats are exactly alike.
The appearance of merle depends greatly on the Yorkie’s underlying coat color and other color genetics. This can create noticeably different expressions of the pattern, including Black Merle, Blue/Gray Merle and Chocolate Merle. Merle may also occur alongside parti coloring, adding prominent areas of white to the coat and creating a Merle Parti appearance.
Breeders sometimes use descriptive names for these different merle appearances. “Chocoberry Merle” is commonly used for the chocolate-merle appearance, “Blueberry Merle” for the blue/gray-merle appearance and “Blackberry Merle” for the darker black-merle appearance. When the parti pattern is also present, these may be described as Chocoberry Merle Parti, Blueberry Merle Parti or Blackberry Merle Parti. These are descriptive breeder terms rather than separate genes or standardized genetic classifications.
Merle can also affect eye pigmentation, which is why some merle Yorkies may have blue, partially blue or differently colored eyes. The amount of merling, its placement and the resulting coat appearance can vary considerably from one dog to another.
Blueberry Merle is a descriptive breeder term used for the cool blue-gray or silver expression of the merle coat. Instead of the warmer brown and cream tones seen in Chocolate Merle, these Yorkies display cooler shades ranging from deep charcoal and slate to steel blue, silver and pale gray. The merle pattern creates irregular variations throughout the darker pigment, giving each coat its own distinctive marbled appearance.
The pattern is often especially noticeable during puppyhood, when the shorter coat makes individual areas of dark and diluted pigment easier to see. As the Yorkie’s silky coat grows longer, those same areas may appear softer and more blended, creating flowing variations of blue-gray, silver and charcoal rather than clearly defined patches.
Merle can also produce striking variations in eye pigmentation, including blue eyes, partially blue eyes and what breeders sometimes call “glitter eyes,” where blue and brown pigmentation appear together within the same iris. Although shown here with a Blueberry Merle, these eye variations are associated with the merle pattern itself and may occur in Chocolate, Blue/Gray or Black Merle Yorkies.
The Blue/Gray (Blueberry)
Parti Merle
Understanding the Merle Coat
The Chocolate (Chocoberry)
Merle Parti
Understanding the Blueberry Merle Coat
Blueberry Parti Merle combines two distinct coat patterns: parti and merle. The parti pattern creates the prominent white areas of the coat, while merle creates irregular areas of diluted and full pigment within the colored portions. When those pigmented areas develop in cool blue-gray, slate, silver and charcoal tones rather than warmer chocolate shades, breeders may describe the dog as a Blueberry Parti Merle.
Because the parti pattern limits where pigment appears, the merle pattern is generally visible within the colored patches rather than throughout the white portions of the coat. This can create a striking contrast between a predominantly white coat and patches containing several shades of blue-gray, silver and darker pigment. The amount, placement and intensity of both the parti and merle markings can vary considerably from one dog to another.
As the coat matures, the appearance may change as well. Puppy markings that initially appear sharply defined can become softer or more blended as the Yorkie’s longer silky adult coat develops. Some dogs retain bold, easily recognizable patches while others develop a more subtle mixture of silver, blue-gray and charcoal throughout their colored areas.
The Chocolate (Chocoberry) Merle
The Blue/Gray (Blueberry) Merle
What Is Chocoberry Merle Parti?
Chocoberry Merle Parti describes a chocolate merle Yorkie that also carries the parti pattern. While Chocoberry Merle refers to the chocolate-based merle coloring, the addition of parti creates the prominent areas of white seen throughout the coat. Chocolate merle patches may appear in rich brown, cream, tan and softer diluted or marbled shades against the white areas.
Because both merle and parti affect the appearance of the coat, the amount and placement of white and merled coloring can vary considerably from one dog to another. Some Chocoberry Merle Parti Yorkies may be predominantly white with scattered chocolate-merle patches, while others may display much more chocolate and merling.
Understanding the Blueberry PMerle Coat
“Blackberry Merle” is a descriptive breeder term generally used for particularly dark, black-based merle Yorkies. It is not the name of a separate merle gene or standardized genetic color.
Rather than the lighter silver and blue-gray appearance commonly described as Blueberry Merle, Blackberry Merles retain especially deep areas of black or near-black pigment broken by charcoal, gray, slate or silver merling.
The contrast can range from subtle to dramatic. Some retain large areas that appear nearly solid black with smaller streaks or patches of gray and silver, while others display more obvious marbling throughout the darker portions of the coat.
As the Yorkie matures, the longer adult coat can change how the pattern appears. Areas that look sharply separated on a puppy may become softer and more blended as the silky coat grows, while particularly dark areas may remain bold and provide the deep coloring that inspired the breeder term Blackberry.
Understanding the Blackberry Merle Coat
The Dark Black-based
(Backberry) Merle
The Dark Black-based
(Backberry) Parti Merle
Blackberry Parti Merle is a descriptive breeder term used for a Yorkie that combines a predominantly white parti pattern with black-based merle pigmentation. “Blackberry” is not a separate gene or standardized genetic classification. It describes the rich black, charcoal, silver and gray appearance that can occur within the pigmented portions of the coat.
The parti and merle patterns are separate genetic traits. Parti, or piebald white spotting, produces areas of white where coat pigment is absent, while merle affects eumelanin, the dark pigment responsible for black and brown coloration. In a black-based dog, merle can create irregular areas of black, charcoal, silver and gray with darker streaking, mottling or marbling. As the Yorkie's coat grows longer, these markings may become softer and more blended, creating streaks and ribbons of color through the silky adult coat.
Merle may also influence eye pigmentation. Blackberry Parti Merles may have brown eyes, blue eyes, one of each or an iris containing both blue and brown pigmentation. These mixed-color eyes are sometimes informally called “glitter eyes.” Glitter eyes are not specific to Blackberry Merles and may occur with any merle coloration.
From Puppy to Adult Blackberry Parti
Merle Coat
Genetics, Safety & Standard Note
Merle is caused by a variant in the PMEL gene, and some dogs may carry merle while showing very little or no obvious pattern. Because of this, DNA testing is especially important when merle is present or suspected in a breeding program. Breeding two merle-carrying dogs can increase the risk of double-merle puppies, which may have serious hearing and vision problems.
Merle and merle parti colors fall outside the traditional Yorkshire Terrier show-standard colors. Terms such as Chocoberry, Blueberry and Blackberry are descriptive breeder terms used for particular merle appearances, not separate genes or standardized genetic classifications. DNA testing can identify known color and pattern variants, but it cannot by itself tell us when or how those variants first entered a particular Yorkie bloodline.
The Black Yorkie
From Puppy to Adulthood
Black Yorkies have a predominantly black coat that remains dark into adulthood rather than developing the familiar steel-blue adult coat of a traditional Yorkshire Terrier. While some black Yorkies may carry dominant black (Kᴮ) at the K locus, appearance alone cannot tell us which genetic combination is responsible for a dog’s black coat. DNA testing is the most reliable way to identify the known coat-color variants an individual dog carries.
Like other Yorkies, their coats can change considerably from puppyhood to adulthood. Coat length, texture and subtle shading may develop with maturity, but a black Yorkie retains an overall dark appearance rather than clearing to the traditional blue-and-tan adult coloring.
Understanding the Black Coat
Understanding the Black Coat
The genetics behind a black coat can involve several interacting coat-color genes. One possibility involves the K locus, where the dominant black variant, Kᴮ, can prevent the usual tan-point pattern from being expressed, resulting in a predominantly black coat.
However, appearance alone cannot confirm that a Yorkie carries Kᴮ. Other genetic combinations can also influence how dark pigment is expressed, so two dogs that look very similar may have different genetic profiles. DNA testing can identify known coat-color variants and provide a clearer understanding of the genetics responsible for an individual dog's coloring.
Because coat-color genes can be carried without always being visually apparent, understanding a dog's genetic results is particularly useful in a breeding program. It allows breeders to make informed pairing decisions and better predict the colors and patterns that may appear in future generations.
I think this fits your page much better because the first section explains what happens from puppy to adult, while this section actually teaches visitors what Kᴮ means and why DNA testing matters.
