While often caused by a bacterial or viral infection, laryngitis can be a sign of another underlying issue, and can accompany such conditions as tracheobronchitis, distemper, heart disease, trauma, or an issue with the internal tissues, such as paralysis of the larynx or a trachea problem. The occasional to constant coughs can cause changes in vocalization, and the swelling from inflammation can lead to an obstructed airway in extreme cases. If the affected dog cannot cool itself down by panting, it may collapse. Many of the causes of laryngitis can be treated, and medical attention should be sought immediately for any breathing difficulties.

Laryngitis is the condition of an inflamed larynx, often caused by an infection. The larynx, or voice box, is the cartilage that prevents choking by closing off the trachea during swallowing. Laryngitis usually starts with a dry cough, but as the fluid builds up and the swelling of the larynx increases, it can affect the heart rate, breathing, and can lead to respiratory distress if not treated.

Symptoms of laryngitis can include:

Laryngitis is usually caused by a bacterial or viral infection, but it can be caused by another underlying issue. Causes can include:

Help your veterinarian correctly diagnose your dog by reporting any symptoms you’ve noticed. Other information such as your dog’s breed, travel history, environment, medical history and medications taken, any incidences of trauma, vocal changes, and any contact with other animals can help your veterinarian come to a diagnosis of laryngitis. A definite diagnosis can be made based on these factors, a physical examination, an exam of the larynx, test results, and your dog’s response to any treatment. Your veterinarian will also observe your dog’s respiration.

Other tests may include a urinalysis, serum analysis, bronchoscopy, cytologic exam of bronchoalveolar fluids, gastroduodenoscopy, tissue biopsy,  chest X-rays, neurological exam, endocrine studies, EMGs, and culture samples. Identification of the underlying cause is needed to be able to correctly treat the condition.

Most mild cases are straightforward and resolve quickly with minimal intervention.

In the treatment of severe laryngitis, the first goal is to stabilize your dog if unstable. This can be done by relieving any airway obstruction, reducing inflammation, and getting oxygen into the lungs. Oxygen therapy, intubation, and ventilator support can be used, often with sedation if needed. If there is an obstruction in the larynx, a tracheotomy tube may be placed through an opening in the neck to allow the dog to breathe while the problem is fixed.

Any underlying cause needs to be treated, as well as concurrent conditions. Treatments can include anti-inflammatories to reduce the swelling, often along with systemic antibiotics. Diuretic drugs can be prescribed to eliminate fluid from the larynx and lungs. Cough suppressants and bronchodilators, which create bronchodilation and may reduce swelling, can be used. Antiparasitics, antimicrobials, and antacids are given as needed. Any heart or lung disease, abnormality, or cancer is treated appropriately.

Surgery may be needed for some conditions, such as to correct a muscular laryngeal issue or to remove obstructions. Supplementary care may be prescribed to help recovery, such as humidified air, diet modification, external cooling, and confinement in a clean, dust free environment.

The earlier treatment is given, the better the outcome is for your dog. Many causes of laryngitis can be treated with supportive care and medications. If the larynx or any surrounding cartilage areas in the airway incur chronic damage, the prognosis can be worse. Your veterinarian will likely prescribe medication to be administered at home, and a list of supplementary care to help your dog recover. Always notify your veterinarian if your dog has continuing breathing difficulties.