Paroxysmal Dyskinesia in Welsh Terriers A recent study by Dr Whittaker and the team at the RVC in London, published in The Veterinary Journal, has highlighted a potentially heritable movement disorder in Welsh Terriers. Paroxysmal dyskinesia (PD) is an 'umbrella' term for disorders characterised by recurrent episodes of involuntary and abnormal movement or muscle tone with variable duration. Multiple breeds have now been documented with PD. In this study, the episodes were predominantly characte