SYMPTOM
Stridor
Owners may observe stridor in their pet.
Various conditions
This symptom can occur in multiple conditions and warrants further assessment.
Why timing matters
Early observation
Early recognition allows prompt assessment and intervention if needed.
Later presentation
Persistent or worsening signs may indicate progression requiring attention.
The significance of this symptom depends on its context, duration, and associated findings.
Conditions commonly associated
Laryngeal Paralysis
The harsh, high-pitched breathing noise results from air turbulence through the narrowed laryngeal opening.
Laryngeal Paralysis in Dogs
Stridor in laryngeal paralysis arises when the cartilages of the larynx fail to open fully during inhalation, creating turbulent airflow through a narrowed airway. This high-pitched inspiratory sound tends to become more pronounced during exercise or in warm conditions when breathing effort increases.
Feline Asthma
Stridor can occur during acute episodes of feline asthma when severe airway constriction and inflammation create turbulent flow in the upper airways. This sound may accompany wheezing and increased respiratory effort during periods of bronchospasm.
Pneumonia
Pneumonia can produce stridor when inflammation and fluid accumulation affect the upper airways or when the increased work of breathing creates turbulent flow through the larynx and trachea. This presentation tends to occur alongside other respiratory signs such as coughing and increased respiratory rate.
Megaoesophagus
Stridor may be observed in megaoesophagus when accumulated food material in the dilated oesophagus compresses the adjacent trachea, or when aspiration of oesophageal contents causes upper airway inflammation and partial obstruction. This relationship reflects the close anatomical proximity of the oesophagus and respiratory structures.
When to explore further
When the symptom is persistent or worsening
When other signs are present alongside
When daily activities or quality of life are affected
When there is uncertainty about the cause
Noting when this symptom occurs, any triggers, and how it changes over time can provide useful information for veterinary discussions.
Last reviewed: 24 April 2026 · Dr Alastair Greenway MRCVS