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a large dog with a distinctive elongated, flat head and nose. There are two varieties, the rough-coated (longhaired) and the smooth-coated (shorthaired), which are regarded as separate breeds in the United Kingdom. In the more common rough Collie, a thick, long coat forms a ruff or mane around the neck and front of the chest. The breed originated in Scotland as shepherd's dog and the rough-coated variety is also called a Scotch collie. The breed suffers from inherited abnormalities in eye development, collectively called collie eye anomaly, inherited epilepsy, hemophilia A, patent ductus arteriosus, cerebellar degeneration and cyclic neutropenia. It is also predisposed to nasal solar dermatitis (so-called collie nose).
Collie ectasia syndrome
see collie eye anomaly (below).
Collie eye anomaly
an autosomal recessive inherited trait which results in incomplete closure of the embryonic fissure; seen almost exclusively in Collies, Border collies and Shetland sheepdogs. Associated defects include scleral ectasia, coloboma of the optic disk, retinal folds and detachment, and microphthalmia. Called also collie ectasia syndrome.
see nodular fasciitis.
see shetland sheepdog.
a depigmenting, crusting dermatitis of the planum nasale, adjacent skin on the dorsum of the nose, and sometimes lip and eyelid margins. Occurs most commonly in sunny climates and in individual dogs with the greatest exposure to sunlight. Once believed to be a breed-specific disorder related to the long nose of collies, it is now known that several diseases produce similar clinical features and in many breeds. These include discoid and systemic lupus erythematosus, pemphigus erythematosus and pemphigus foliaceus, as well as solar dermatitis.