Laryngeal paralysis in dogs: a review of 23 cases.

The medical records of 23 dogs with laryngeal paralysis were reviewed. Although the condition developed mainly in old, large- or giant-breed dogs, a wide range of breeds was involved. The age of affected animals ranged from 7 months to 14 years. Respiratory distress, exercise intolerance, noisy breathing, and hoarse bark were common signs of the paralysis. Laboratory evaluations for hypothyroidism were performed on 11 dogs; only 3 were judged to have primary hypothyroidism. Males, particularly if castrated, were more frequently affected than females. A neurologic examination was performed on 6 dogs; 4 of them were found to have generalized neuromuscular disease.