Variants in KCNJ10 are widely reported to explain spinocerebellar ataxia in affected dogs, a variant in another gene, CAPN1 (c.344G>A), is reported in Parson Russell terriers presenting with spinocerebellar ataxia without myokymia, neuromyotonia or epilepsy.17 Here, CAPN1 is linked to Myokymia.