A number of serious neurological / neuromuscular diseases affect Labrador Retrievers, including polyneuropathy (centronuclear
myopathy), laryngeal paralysis, megaesophagus, myasthenia
gravis, cerebellar ataxia, narcolepsy, and also vague head tremors that may be the result of unknown abnormalities in the brain.
Polyarthritis is often considered the Great Imitator as patients suffering from this problem can appear very similar to patients with intervertebral disc disease,
myopathies, meningitis, and even myasthenia
gravis.