Kennel cough in a vaccinated dog: why it happens
3-year-old Border Collie with core vaccines up to date and an intranasal Bordetella and parainfluenza vaccine given 2 months ago. Five days after coming home from boarding kennels it has a dry, paroxysmal cough with retching, no fever, a good appetite and is otherwise well. The owner thinks the vaccine has not worked.
Which explanation is the most correct?
chevron_right Show answer and explanation
A. The vaccine was poorly stored; a properly vaccinated dog cannot get kennel cough
Although a storage failure is possible, it is not the most likely explanation. Bordetella and parainfluenza vaccines reduce signs and shedding, but do not prevent all infection.
B. It is probably distemper, as it is the main cause of cough in boarding dogs
The dog is vaccinated against distemper, which would also cause fever, oculonasal discharge and systemic illness. In kennels, an isolated cough in a dog that is otherwise well points to the respiratory complex.
C. The cause is always Bordetella bronchiseptica, which is resistant to vaccine immunity
Bordetella is an important agent, but not the only one, and the vaccine does reduce the disease it causes. Attributing everything to Bordetella leads to antibiotic treatment of viral, self-limiting cases.
D. It is a multifactorial complex: agents not included in the vaccines are involved (respiratory coronavirus, influenza, pneumovirus, Mycoplasma cynos), and vaccines reduce severity, not always infection
Correct. Canine infectious respiratory disease complex is caused by several viruses and bacteria, often as co-infections. Vaccines cover parainfluenza, adenovirus type 2 and Bordetella (plus distemper), but not the others.
lightbulb Key takeaway
Most uncomplicated kennel cough cases resolve on their own in 1–3 weeks. Watch for signs of pneumonia (fever, lethargy, anorexia, tachypnoea) and isolate the dog while it is coughing. Explain to the owner that vaccination reduces risk and severity but does not protect against every agent.
Test yourself with 10 random questions
Infectious diseases · 100 questions, a different test every time
Related questions
Updated: October 31, 2026 · Educational content for veterinary professionals. It does not replace current clinical guidelines or the judgement of the attending veterinarian.