Examples of acceptable Boston Terrier Colors. Looking to mate my Boston Terrier Seal and White 24 pounds 500 or pick of the litter (n Miami, Florida » Boston Terrier $500: Boston Terrier looking for a girlfriend [shelbymom217] 24 pounds Seal and white (brown) Has papers Has has several litters Country walk area Seal is defined in the standard as "Seal appears black except it has a red cast when viewed in the sun or bright light". Two colors and one color pattern are the only acceptable Boston Terrier Colors in the AKC and BTCA standard. The Boston Terrier, sometimes affectionately referred to as the “American Gentleman” due to their classic tuxedo appearance, is a non-sporting breed. The … One of the colors is Seal. Example of seal: This is an accepted and desirable color in the Boston Terrier. They originated in the United States around 1870 and was the first non-sporting dog breed to originate in the US. The Boston Terrier is a lively, highly intelligent, smooth coated, short-headed, compactly built, short-tailed, well balanced dog, brindle, seal or black in color and evenly marked with white. Note the two pictures below of the same dog - on the left when not in bright sun, she appears nearly black.