Updated September 25, 2026. Fact-checked against veterinary sources; review by a licensed veterinarian is in progress. See our editorial policy.
Quick answer: Older dogs can develop more serious complications from respiratory infections, including pneumonia, especially if they have heart disease, airway problems, or weakened immunity. A cough in a senior dog also isn’t always an infection: heart disease, collapsing trachea, chronic bronchitis, laryngeal paralysis, and lung tumors can cause similar signs. Any lasting or worsening cough in an older dog deserves a vet visit.
Why seniors are at higher risk
- Weaker immune responses
- Existing heart or lung conditions
- Swallowing problems that raise aspiration pneumonia risk, as with laryngeal paralysis
Conditions that look like infection
- Heart disease and heart failure. See heart disease in senior dogs
- Collapsing trachea
- Chronic bronchitis
- Laryngeal paralysis
- Lung tumors
See a vet if
- A cough lasts more than a few days
- Your dog has fast or labored breathing at rest
- Fever, lethargy, or poor appetite
- Coughing at night or after lying down
Home care
- Rest, humidity, and a harness
- Count sleeping breaths and report increases
- Keep vaccines current as your vet advises
Sources
- Merck Veterinary Manual: Canine infectious respiratory disease complex
- Lappin MR, et al. Antimicrobial use guidelines for treatment of respiratory tract disease in dogs and cats: ISCAID. J Vet Intern Med. 2017
- AAHA Senior Care Guidelines for Dogs and Cats. 2023
This article is for general education and is not a substitute for care from your own veterinarian. Learn about The Pet Vet and our editorial policy.