Cerebellar Ataxia 1 (Belgian Shepherd Type) is a progressive, early-onset, inherited disease affecting Belgian shepherd dogs. Symptoms usually present in the first four to eight weeks of life and progress quickly. Affected dogs are unable to regulate potassium, needed for proper nerve function in the central nervous system. These dogs have difficulty controlling leg movements and keeping their balance. Owners may observe pets stumbling, staggering, circling, pacing, tremors, and falling. Most affected dogs are euthanized before 6 months of age due to severity and progression of clinical signs.