Heim was sure that the Greater Swiss Mountain Dog was the most widely kept dog in the mountain areas of Switzerland between 1860 and 1870, but the prevailing theory asserts that within 30 years, it had nearly disappeared. Treatment varies from vet to vet, some choosing to freeze the affected hair follicles and others choosing to use electrocautery. Most cases do not require any treatment. Entropion, found in about 3% of the breed, is the rolling in of the eyelids, which causes the eyelashes to irritate the eye.
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