The Neonatal Ataxia mutation in Jack Russell Terriers was found in May 2019.
Neonatal Ataxia (NNA) is a progressive, neonatal onset, cerebellar ataxia described in Jack Russell Terriers. Similar to other ataxias known in Jack Russell, Parson Russell, and Russell Terriers, clinical signs consist of intention tremors, loss of coordination, and inability to stand and move in a forward direction.