CONDITION
Laryngeal Paralysis
Laryngeal paralysis describes a loss of normal movement in one or both sides of the larynx, the structure at the top of the windpipe that opens during breathing and closes during swallowing. When the cartilages that form the larynx no longer pull apart as they should, the airway narrows, and breathing becomes noisier and more effortful, particularly during exercise or in warm weather. Owners often notice a change in the sound of breathing first: a harsh, raspy noise on the in-breath, sometimes described as roaring or stridor. The change may be gradual, appearing over months, or it may become obvious quite suddenly during exertion or heat, when a dog can tip into a life-threatening breathing crisis. Some dogs also develop a different bark, tire more quickly on walks, or cough or gag when drinking. Laryngeal paralysis is seen most often in older, large-breed dogs, though it can occur in younger animals or smaller breeds in certain contexts. This page explores what laryngeal paralysis may look like in day-to-day life, the mechanisms that can lead to it, how it is investigated, and the range of approaches that exist for supporting affected dogs. The condition varies widely in how it progresses and in the degree to which it affects quality of life, and understanding that spectrum can help frame conversations about monitoring and intervention.
Why this matters now
Laryngeal paralysis primarily affects older large breed dogs, particularly Labrador Retrievers, Golden Retrievers, and Irish Setters. The condition is increasingly recognised as part of a broader neurodegenerative condition called geriatric onset laryngeal paralysis polyneuropathy (GOLPP). Signs typically develop gradually, often first noticed during warm weather or exercise.
The condition progresses slowly over months to years. Initially, dogs may simply sound different when breathing or panting. Exercise tolerance gradually decreases as airway obstruction worsens. Episodes of severe breathing difficulty can occur during excitement, heat, or exercise, and a severe episode can end in collapse and death from airway obstruction and overheating. The underlying nerve degeneration affecting the larynx also causes progressive weakness in the hind limbs in many affected dogs.
Signals & patterns
Early signals
Change in bark
The bark may become hoarse, weak, or different in pitch as laryngeal function decreases.
Noisy breathing during exercise
A raspy or stridor-like sound during panting or increased activity is often an early sign.
Mild exercise intolerance
Dogs may tire more easily or need to rest during walks.
Panting more than usual
Increased respiratory effort may manifest as excessive panting, especially in warm conditions.
Later signals
Loud stridor during breathing
A harsh, high-pitched breathing noise becomes audible even at rest.
Episodes of severe breathing difficulty
Excitement, heat or exercise can trigger an episode in which the dog works hard for every breath, the breathing noise becomes very loud, and the tongue and gums turn dark red, purple or blue (cyanosis). Because dogs lose heat by panting, an affected dog also overheats in conditions that would not trouble a normal dog. In severe cases the airway is sucked shut, and the dog can collapse and suffocate. How close an episode is to that point cannot be judged at home.
Weakness in hind legs
Progressive hind limb weakness often develops as part of the broader neuropathy.
Coughing or gagging when eating
Laryngeal dysfunction affects airway protection during swallowing, risking aspiration.
Click to read about the biological mechanisms
How this is usually investigated
Diagnosis requires visualisation of laryngeal function during light anaesthesia. Assessment also evaluates for the broader neurological condition and rules out other causes.
Laryngeal examination under light anaesthesia
Neurological examination
Thoracic radiographs
Blood tests and thyroid function
Electromyography
Options & trade-offs
Management depends on severity. Mild cases may be managed conservatively, whilst more severe cases often benefit from surgical intervention.
Lifestyle modification
Avoiding heat, excitement, and strenuous exercise to minimise respiratory demands.
Trade-offs: Appropriate for mild cases. Requires adjustments to daily routine. Air conditioning and avoiding midday walks help in warm weather.
Weight management
Maintaining lean body weight to reduce respiratory effort.
Trade-offs: Reduces oxygen demand and makes breathing easier. Important component of conservative management.
Tie-back surgery (arytenoid lateralisation)
Surgically fixing one laryngeal cartilage in an open position.
Trade-offs: Often significantly improves breathing and quality of life. Increases aspiration risk since the airway is permanently partly open. Aspiration pneumonia is the most common complication: in one series of 232 dogs it had occurred in 18.6% by one year after surgery and 31.8% by three years.
Hospital treatment of a breathing crisis
Sedation, oxygen and external cooling given in a veterinary hospital during a respiratory crisis.
Trade-offs: Used when breathing difficulty becomes severe, and may include passing a breathing tube and assisted breathing for a short time. Sedation reduces anxiety and oxygen demand while the airway is secured. It stabilises the dog but does not change the underlying paralysis, and it cannot be reproduced at home.
Physiotherapy for hind limb weakness
Exercises and support to maintain mobility as polyneuropathy progresses.
Trade-offs: Addresses the broader neurological condition. Helps maintain muscle mass and function as long as possible.
Common misconceptions
"Laryngeal paralysis only affects breathing"
The condition is often part of a broader neurodegenerative disease affecting nerves throughout the body. Hind limb weakness commonly develops alongside or after the laryngeal signs.
"Surgery completely cures the condition"
Tie-back surgery significantly improves breathing but creates some ongoing aspiration risk. The underlying neurological degeneration continues to progress.
"Loud breathing in old Labs is normal"
Progressive noisy breathing and falling exercise tolerance in an older large-breed dog are not a normal part of ageing. They are the typical early picture of laryngeal paralysis, a significant condition worth assessing.
Related conditions
Tracheal Collapse
Tracheal collapse can produce similar signs to laryngeal paralysis (noisy breathing, coughing, and exercise intolerance), though tracheal collapse mostly affects small breeds and typically produces a honking cough, and telling the two apart often requires direct visualisation of the airway.
Megaoesophagus in Dogs
Megaoesophagus and laryngeal paralysis can occur together in dogs, particularly in the context of generalised neuromuscular conditions, and both involve a loss of coordinated movement in structures that normally protect the airway during swallowing.
Congestive Heart Failure in Dogs
Congestive heart failure may sometimes be considered when a dog presents with exercise intolerance and breathing difficulty, though the pattern of respiratory noise and the absence of fluid accumulation in the lungs typically help distinguish it from laryngeal paralysis.
Brachycephalic Obstructive Airway Syndrome (BOAS) in Dogs
Brachycephalic obstructive airway syndrome can share some features with laryngeal paralysis (particularly noisy, effortful breathing that worsens with heat or exertion), but the anatomical basis and the age and breed profile tend to differ markedly.
Noting changes in bark sound, breathing noise, and exercise tolerance provides useful context. Observing whether signs worsen in hot weather or during excitement helps identify patterns. Tracking hind limb strength and coordination over time indicates whether broader neurological changes are occurring. Adjusting activity levels and avoiding heat exposure reduce the triggers in milder cases but do not remove the risk of a crisis. A dog with laryngeal paralysis that is fighting to breathe, has a dark red, purple or blue tongue, or has collapsed is in a state that can be fatal and that cannot be assessed or managed at home.
Last reviewed: 9 October 2026 · Dr Alastair Greenway MRCVS