Neuroaxonal dystrophy (NAD) is a group of inherited neurodegenerative diseases characterised by the presence of spheroids (swollen axons) in the central nervous system. In Miniature American Shepherds, this disease manifests itself as a progressive weakening of the hind limbs, an unsteady gait and coordination problems (ataxia). Affected dogs often show these symptoms from young adulthood, leading to increasing difficulty in moving around. NAD can progress slowly, and although the disease is not immediately fatal, it can seriously affect the quality of life of affected dogs, sometimes leading to euthanasia due to the severity of the symptoms.

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