Multiple system degeneration usually begins between 9 weeks and 6 months of age. The first signs include mild tremors and stiffness of the forelimbs.
Within 3 to 4 months, symptoms worsen, with severe ataxia, spasticity, an unsteady gait, and delayed postural reactions. The disease progresses to immobility and inability to stand, often leading to euthanasia between 1 and 2 years of age.

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