The Greater Swiss Mountain Dog (German: Grosser Schweizer Sennenhund or French: Grand Bouvier Suisse) is a dog breed which was developed in the Swiss Alps. It was assumed to have almost died out by the late 19th century, since its work was being done by other breeds or machines, but was rediscovered in the early 1900s. While the Greater Swiss Mountain Dog Standard calls for a black, white and rust dog; they do come in other colors which include blue, white and tan tri-color; and rust and white bi-color. The two most common eye issues that Greater Swiss Mountain Dogs face are distichiasis and entropion, with distichiasis being the most common issue. Distichiasis is the presence of extra eyelashes along the eyelid. Distichiasis has been reported in 19%, of the breed and in the vast majority of cases it is non-symptomatic and does not cause an issue for the dog.
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