Symptom Analysis

Stertor Symptom Guide for Pets | Observation Points and When to Seek Care

Understand possible causes of Stertor and home observation points

When stertor occurs, observe respiratory rate, episode timing, and body position, and record details for evaluation.

Last updated: 2026/08/16
Pet Health Map Editorial Team
Sources: WSAVA, AAHA

What this symptom means clinically

Stertor is a low-frequency sound caused by soft-tissue vibration as air passes through the upper airway, often reflecting partial narrowing or mucosal swelling of the nasal cavity, pharynx, or larynx. It can occur during inspiration or expiration and signals altered upper-airway airflow.

🐱 In cats

Cats less commonly make obvious stertor; when present it often relates to nasal or pharyngeal swelling, secretions, or limited airway space.

🐶 In dogs

Dogs, especially brachycephalic breeds, more commonly develop stertor from narrow upper-airway anatomy and soft-tissue vibration.

Clinical signs you can observe

Check whether your pet shows any of the signs below. If several apply, seek veterinary care promptly.

Record the date, time, and context when stertor was first noticed.
Measure or estimate the affected area or vital value when applicable, and write down the exact value and unit.
Take clear photos or short videos from the same angle and label the date and time.
Observe whether stertor is intermittent, persistent, improving, or worsening, and record duration.
Record related behavior changes such as appetite, activity, grooming, pain response, or avoidance of touch.
Compare left and right sides or resting and activity states when relevant, and record asymmetry or changes.
Record any discharge, bleeding, color change, temperature change, or odor when relevant.

Possibly Related Conditions

Conditions owners commonly find associated with this symptom — tap to learn more.

Internal Medicine

Nasal Discharge

Disease-induced changes reduce lung compliance or airway patency. This pulmonary compromise manifests as stertor.

Internal Medicine

Hypercapnia

Pulmonary pathology impairs ventilation and gas exchange. This respiratory dysfunction manifests as stertor.

Oncology

Chondrosarcoma, Nasal and Paranasal Sinus

Neoplastic involvement causes airway obstruction or pleural effusion. This respiratory compromise presents as stertor.

Internal Medicine

Cryptococcosis

Respiratory pathogens cause airway inflammation and alveolar damage. The pulmonary infection manifests as stertor.

Internal Medicine

Dyspnea and Respiratory Distress

Pulmonary pathology impairs ventilation and gas exchange. This respiratory dysfunction manifests as stertor.

Internal Medicine

Cough

Pulmonary pathology impairs ventilation and gas exchange. This respiratory dysfunction manifests as stertor.

This page helps owners understand symptoms and recognise risk; it cannot replace an in-person veterinary examination, diagnosis or treatment. If your pet shows any symptoms, please consult a qualified veterinarian as soon as possible.

Frequently Asked Questions (FAQ)