Labrador Retrievers are both extraordinarily special and extraordinarily common. As America’s favorite breed, there are far more registered Lab puppies than any other breed, and there are probably more unregistered Lab puppies than unregistered puppies of any other breed, as well.
The American Kennel Club (AKC) recognizes three colors in Labradors: yellow, black, and chocolate. There are two body types:
• a leaner, taller body type that is common in dogs bred for hunting, and
• a heaver, shorter dog that is common in dogs bred for showing in AKC conformation events.
The “S” solid color gene
Both body types come in solid colors of yellow, black, or chocolate, but a tiny amount of white on the chest is acceptable. The gene that controls for the color to completely cover the body everywhere is E, and the gene that controls for color to only partly cover the body is “e.” When labs were originally bred, there were probably dogs with “e” gene because there were some spotted or parti-colored Labrador ancestors. Because AKC standards encouraged solid colors, dogs with spots or patches of color (parti-colored) were not officially sanctioned. If these spotted or multicolored Labrador Retrievers appear for sale today, the odds are that the puppies:
• are not pure bred Labradors or
• are carrying unusual DNA, such as XXY chromosomes.
Other Labrador color genes: si, sp, and sw
The ideal Labrador has the solid color “S” gene, and this leads to the all yellow, all black, or all chocolate coat, that can include a few white hairs on the chest. There are several variants of the “S” gene, and they can show up in the Labrador either because both parents have the gene, or the Labs were bred with dogs that are not Labradors. When Labradors have has an unacceptable coat color, they can’t be registered with the AKC, but they can be perfectly wonderful dogs. Variants of the “S” gene include si, sp, and sw.
The “Irish” si gene
The gene “si” denotes the “Irish” white pattern, which is common in herding dogs with white on the collar, chest, and feet.
The “piebald” sp gene
The “sp” is the piebald gene, which produces a small amount of white on the chest and toes.
The wide white “sw” gene
The “sw” gene is a wide, white color pattern, which produces large white spots or a parti-colored coat.
Other genes for coat color patterns
In addition to having variants of the “S” gene, Labradors can carry genes for black and tan and for brindle, but dogs that express these genes are not registered as Labradors by the AKC.
Spot of Bolo or Mark of Bolo
Labrador Retrievers can also have a small white patch above the carpal pad at the back of the foot that is called the mark of Bolo. The English Champion Labrador Retriever, Banchory Bolo, had white patches above the carpal pad and modern breeders of dogs with white carpal patches call them the Bolo spot. In fact, no one has done the genetic work to prove that modern dogs with Bolo spots are related to the old Champion Bolo.
Color does not affect health, but it affects price
Whether a Labrador Retriever is black, yellow, chocolate, piebald, spotted, brindled, or has the mark of an Irish herding dog does not affect its health. This is different than is the case of coat color in some breeds where color is associated with skin problems and baldness. In Labrador Retrievers, many colors can indicate a healthy dog, but only those with AKC acceptable solid black, yellow, or chocolate can be registered. It would seem unwise to pay much money for a “special” Labrador Retriever that is spotted or unusually colored. My advice If you want a dog because you like its looks, go for it, but don’t believe it is a “purebred” Labrador Retriever unless it looks like all the other purebred Labs.
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