Why Does My Dog Keep Coughing?
QUICK ANSWER
A persistent cough in dogs can be caused by kennel cough, allergies, tracheal collapse, heart disease, pneumonia, or a foreign object in the throat. The type of cough, when it happens, and what other symptoms are present all help determine the cause.
An occasional cough is no big deal. But when your dog is coughing repeatedly, especially if it's been going on for more than a day or two, there's usually something specific behind it. The sound of the cough and when it happens actually tell you a lot about what's going on.
What does a kennel cough sound like?
Kennel cough (infectious tracheobronchitis) produces a distinctive dry, honking cough that often sounds like your dog has something stuck in their throat. It's highly contagious and commonly picked up at dog parks, boarding facilities, daycare, and grooming salons. According to the American Veterinary Medical Association, kennel cough is usually caused by the bacterium Bordetella bronchiseptica, often in combination with a virus like canine parainfluenza. Most cases are mild and resolve on their own within 1 to 3 weeks, but puppies, senior dogs, and dogs with compromised immune systems may need treatment.
What if the cough sounds wet or productive?
A wet, phlegmy cough can indicate pneumonia, bronchitis, or fluid in the lungs. Pneumonia in dogs can be caused by bacteria, viruses, fungi, or aspiration (inhaling food or liquid into the lungs). If the cough sounds wet and your dog also has a fever, rapid breathing, lethargy, or nasal discharge, see your vet promptly. Pneumonia can progress quickly and may require antibiotics, supportive care, or hospitalization depending on severity.
Could it be heart-related?
In older dogs, a persistent cough that's worse at night or after exercise can be a sign of heart disease. As the heart enlarges, it can press on the airways, triggering a cough. This is especially common in small breeds like Cavalier King Charles Spaniels and Chihuahuas. If the cough is accompanied by exercise intolerance, rapid breathing while resting, or a swollen belly, your vet should evaluate your dog's heart with chest X-rays and possibly an echocardiogram.
What about tracheal collapse?
Tracheal collapse is a condition where the cartilage rings supporting the trachea weaken and flatten, partially blocking the airway. It produces a distinctive "goose honk" cough that's often triggered by excitement, pulling on a leash, or drinking water. It's most common in small and toy breeds like Pomeranians, Yorkshire Terriers, and Chihuahuas. While mild cases can be managed with weight control, harnesses instead of collars, and cough suppressants, severe cases may require surgical intervention.
A cough that lasts more than a few days, gets worse over time, or comes with other symptoms like lethargy, breathing difficulty, or loss of appetite always deserves a vet visit. The type of cough matters, so pay attention to the sound and timing; that information helps your vet narrow down the cause faster.
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