Inherited Ciliary Disorder in Dogs (Primary Ciliary Dyskinesia, PCD)

  • Occurrence: very rare
  • Location of disease: Chest
Author: Dr. med. vet. Gisa Löwe | Last modified: 08.08.2026
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When to visit the vet?

Non-urgent see a veterinarian within 2–3 days

?

If the condition worsens / symptoms persist, consult a veterinarian.

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Definition

Primary ciliary dyskinesia (PCD) is a genetic condition in dogs characterized by impaired function of the cilia—tiny, hair-like structures on the cells of the airways. This dysfunction leads to inadequate clearance of the airways and can cause recurrent respiratory infections and other health problems.

Das Wichtigste auf einen Blick

Primary ciliary dyskinesia (PCD) in dogs is a genetic disease that impairs the motility of cilia, small hair-like structures in the airways. These cilia are important for transporting mucus and particles out of the airways. In dogs with PCD, the cilia are either uncoordinated or not motile at all, leading to inadequate airway clearance. The disease is caused by genetic mutations and is inherited in an autosomal recessive manner, meaning a dog must inherit the defective gene from both parents to be affected. PCD occurs more frequently in certain breeds such as the English Springer Spaniel and the Newfoundland, but can occur in any breed.

Common symptoms include Cough, nasal discharge, and Respiratory distress. Diagnosis is often challenging because the symptoms can also occur with other respiratory diseases. Special tests such as ciliary biopsies or nasal swabs are necessary to confirm the Diagnosis. There is no cure; the Therapy focuses on relieving symptoms and preventing complications. This includes antibiotics, anti-inflammatory medications, and respiratory therapies. The Prognosis varies, and lifelong treatment is often required. To prevent PCD, breeders should consider genetic testing to identify carriers of the defective gene and minimize the spread of the disease.

Ursachen

Cilia are microscopic, mobile hair-like structures that line the surface of the airways. Their main job is to transport mucus and trapped particles out of the airways to keep the lungs clean and free of infections. In dogs with PCD, however, these structures are either immobile or beat in an uncoordinated way, leading to inadequate airway clearance.

Genetic mutations are the main cause of PCD. These mutations affect proteins that are essential for the structure and function of the cilia. PCD is usually inherited in an autosomal recessive manner, meaning a dog must inherit the defective gene from both parents to develop the disease.

Studies have shown that PCD is more common in certain dog breeds, indicating a genetic predisposition. Affected breeds include the English Springer Spaniel, the Old English Sheepdog, and the Newfoundland. However, the disease can occur in any dog, regardless of breed.

Symptoms

Rare symptoms:

The symptoms of PCD are often noticeable at a young age and mainly affect the respiratory system. The most common symptoms include chronic Cough, nasal discharge, and recurrent respiratory infections. These symptoms result from the cilia’s inability to transport mucus efficiently, leading to a buildup of mucus and bacteria.

Dogs with PCD may also suffer from sinus infections (sinusitis) and middle ear infections (otitis media). In severe cases, the disease can lead to pneumonia or bronchiectasis, a chronic dilation of the bronchi due to repeated infections and inflammation.

Another common symptom in male dogs is infertility, as cilia also occur in the seminal ducts and play a role in sperm motility. In affected dogs, sperm are often immotile, which impairs reproduction.

Diagnose

Diagnosing PCD can be challenging because the symptoms are non-specific and can also occur with other respiratory diseases. A thorough medical history and clinical examination are the first step in diagnosis. The veterinarian will ask about the medical history and current symptoms and perform a physical examination.

Specialized tests may be required to confirm the diagnosis. A ciliary biopsy or nasal swabs can be performed to examine the structure and function of the cilia under a microscope. Characteristic anomalies indicating PCD are sought.

Additional diagnostic procedures may include chest X-rays or CT scans to assess the condition of the lungs. A blood test and analysis of nasal secretions can also help rule out other causes of the symptoms.

Therapie

Because PCD is a genetic condition, there is currently no cure. Treatment therefore focuses on relieving symptoms and preventing complications. An important part of treatment is regular airway clearance to remove accumulated mucus and prevent infections.

Medications such as antibiotics may be prescribed to treat existing infections. Anti-inflammatory medications may also be used to reduce Inflammatory conditions in the airways. In some cases, mucolytic medications may also be used to make it easier to clear mucus.

Physiotherapeutic measures, such as so-called “respiratory therapy,” can also be helpful. These techniques help mobilize mucus from the airways and facilitate breathing. In severe cases, oxygen therapy may be necessary to support breathing.

Prognose und Nachsorge

The prognosis for dogs with PCD varies depending on the severity of the disease and the response to treatment. With early diagnosis and consistent treatment, many dogs can lead a relatively normal life, even though they require regular veterinary monitoring and care.

However, PCD is a chronic condition that often requires lifelong treatment. Complications such as recurrent respiratory infections and lung problems can impair quality of life and shorten life expectancy. Regular collaboration with a veterinarian is crucial to monitor the dog’s health and adjust treatment.

Prävention

Because PCD is genetic, prevention is primarily directed at breeding practices. Breeders should take care not to use animals with known genetic defects or a family history of PCD for breeding. Genetic tests can help identify carriers of the defective gene and minimize the risk of transmission to offspring.

It is also important that new owners of affected breeds are informed about the risk of PCD and watch for early signs of the disease. Early detection and treatment can help improve the quality of life of affected dogs and prevent complications.

Ausblick auf aktuelle Forschung

Primary ciliary dyskinesia (PCD) is a congenital disorder of motile cilia, those fine cellular projections that transport mucus and pathogens out of the airways. If they do not beat properly, chronic respiratory infections, sinus problems, middle ear infections, and often later bronchiectasis develop early; in some affected individuals, organ laterality defects or fertility disorders also occur. (pubmed.ncbi.nlm.nih.gov, ncbi.nlm.nih.gov)

The most important research outlook currently lies in earlier and more precise diagnostics. PCD is genetically very heterogeneous, and no single test is sufficient for all cases. Therefore, work is being done on a better combination of nasal nitric oxide, high-speed microscopy, electron microscopy, and genetics. The goal is to identify children earlier, before permanent lung damage occurs. (pubmed.ncbi.nlm.nih.gov, pubmed.ncbi.nlm.nih.gov)

A second focus is cause-specific therapy. Much still relies on general respiratory medicine measures because true PCD-specific medications are lacking. Research is therefore investigating genotype-phenotype relationships, organoid models, possible mRNA or gene therapies, and better study endpoints to develop more targeted treatments. These approaches are promising but still largely experimental. (pubmed.ncbi.nlm.nih.gov, pubmed.ncbi.nlm.nih.gov)

Overall, the outlook is good: research is clearly moving from purely symptomatic care toward earlier Diagnosis, genetic precision, and ultimately personalized Therapy.

Frequently Asked Questions (FAQs)

1. What is primary ciliary dyskinesia?
Primary ciliary dyskinesia (PCD) is an inherited condition in which the cilia of the mucous membranes do not function properly. The cilia in the airways normally transport mucus and foreign substances out of the lungs. If this function is impaired, secretions and pathogens accumulate in the airways and cause chronic infections.
2. Which breeds are affected?
PCD has been described in many breeds, but especially in Old English Sheepdogs, Bichon Frisés, Springer Spaniels, Border Collies, and Rottweilers. In some breeds such as the Old English Sheepdog, the disease is well documented and associated with specific gene mutations.
3. What symptoms do affected dogs show?
Typical signs are chronic cough, recurrent respiratory infections with mucoid-purulent nasal discharge, recurrent pneumonia, and progressive bronchiectasis. Puppies often show persistent nasal discharge in the first months of life. Middle ear infections also occur frequently.
4. What is Kartagener syndrome?
In Kartagener syndrome, PCD is accompanied by situs inversus (mirror-image organ arrangement). Because motile cilia also play a role in embryonic development, organ rotation can occur in the opposite direction. About half of PCD dogs show situs inversus.
5. How is the diagnosis made?
Situs inversus on X-ray provides clues. A definitive diagnosis requires ultrastructural demonstration of defective cilia with an electron microscope from a mucosal biopsy or a genetic test, if available for the affected breed. Functional tests of mucociliary clearance provide additional evidence.
6. How is PCD treated?
There is no curative therapy. The focus is on managing secretion retention and infections: inhalations, mucolytics, targeted antibiotic therapy based on antibiogram, respiratory physiotherapy, and avoiding irritants. Some dogs benefit from long-term low-dose antibiotics.
7. What role does respiratory physiotherapy play?
Manual percussion of the chest, postural drainage, and exercise support secretion mobilization. Regular physiotherapy several times a day significantly reduces the frequency of acute infections and is an important component of long-term management.
8. What is the life expectancy?
Life expectancy is reduced and depends heavily on the extent of lung changes. With early diagnosis and consistent management, many dogs reach middle age, but with pronounced bronchiectasis, life expectancy is significantly shortened.
9. Can male dogs with PCD breed?
Many male dogs with PCD are subfertile or infertile because sperm are not motile due to defectively constructed flagella. Affected animals are not suitable for breeding purposes anyway, as the disease is hereditary.
10. What is the breeding relevance of the disease?
PCD is inherited in an autosomal recessive manner. In breeds with a known genetic defect, breeding animals should be tested. Carriers must not be bred together. Consistent breeding selection has been able to significantly reduce the incidence of the disease in some breeds.

Literatur

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  • Edwards, D. F., Kennedy, J. R., Patton, C. S., Toal, R. L., Daniel, G. B., & Lothrop, C. D. (1989). Familial immotile-cilia syndrome in English Springer Spaniel dogs. American Journal of Medical Genetics, 33(3), 290–298. https://doi.org/10.1002/ajmg.1320330303
  • Edwards, D. F., Patton, C. S., & Kennedy, J. R. (1992). Primary ciliary dyskinesia in the dog. Problems in Veterinary Medicine, 4(2), 291–319.
  • Watson, P. J., Herrtage, M. E., Peacock, M. A., & Sargan, D. R. (1999). Primary ciliary dyskinesia in Newfoundland dogs. Veterinary Record, 144(26), 718–725. https://doi.org/10.1136/vr.144.26.718
  • Clercx, C., Peeters, D., Beths, T., McEntee, K., Votion, D., Snaps, F., Henroteaux, M., & Jorissen, M. (2000). Use of ciliogenesis in the diagnosis of primary ciliary dyskinesia in a dog. Journal of the American Veterinary Medical Association, 217(11), 1681–1685. https://doi.org/10.2460/javma.2000.217.1681
  • De Scally, M., Lobetti, R. G., & Van Wilpe, E. (2004). Primary ciliary dyskinesia in a Staffordshire Bull Terrier. Journal of the South African Veterinary Association, 75(3), 150–152. https://doi.org/10.4102/jsava.v75i3.471
  • Merveille, A.-C., Battaille, G., Billen, F., Deleuze, S., Fredholm, M., Thomas, A., Clercx, C., & Lequarré, A.-S. (2014). Clinical findings and prevalence of the mutation associated with primary ciliary dyskinesia in Old English Sheepdogs. Journal of Veterinary Internal Medicine, 28(3), 771–778. https://doi.org/10.1111/jvim.12336
  • Anderegg, L., Im Hof Gut, M., Hetzel, U., Howerth, E. W., Leuthard, F., Kyöstilä, K., Lohi, H., Pettitt, L., Mellersh, C., Minor, K. M., Mickelson, J. R., Batcher, K., Bannasch, D., Jagannathan, V., & Leeb, T. (2019). NME5 frameshift variant in Alaskan Malamutes with primary ciliary dyskinesia. PLOS Genetics, 15(9), e1008378. https://doi.org/10.1371/journal.pgen.1008378
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