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*Hereditary in Collies and Shetland sheepdgs
*Hereditary in Collies and Shetland sheepdgs
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*Lesions resemble [[Muscles Inflammatory - Pathology#Canine polymyositis|canine polymyositis]]
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*Lesions resemble [[Canine Polymyositis|canine polymyositis]]
*Also degeneration of blood vessels -> muscle [[Muscle Ischaemia|microinfarcts]]
*Also degeneration of blood vessels -> muscle [[Muscle Ischaemia|microinfarcts]]
*Usually generalised but temporalis and other masticatory muscles may be involved the most
*Usually generalised but temporalis and other masticatory muscles may be involved the most