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. Extra eyelashes can be seen along the eyelid; sometimes extra eyelashes grow so that they irritate the eye.
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