Salivary Gland Inflammation in Dogs (Sialadenitis)
- Occurrence: common
- Location of disease: Head/Neck
When to visit the vet?
Non-urgent see a veterinarian within 2–3 days
If the condition worsens / symptoms persist, consult a veterinarian.
Definition
Sialadenitis is an inflammation of the salivary glands in dogs, which can be caused by various factors and leads to swelling, pain, and impaired function of the affected glands.
The most important facts at a glance
Sialadenitis in dogs is an inflammation of the salivary glands that can be caused by infectious, traumatic, or immunological factors. The most common pathogens include bacteria that enter the glands via the blood or directly from the mouth. Viruses and autoimmune diseases can also cause inflammation. Tumors or cysts are rarer causes that can lead to inflammation by blocking the glandular ducts. Symptoms include swelling of the salivary glands, swallowing disorders, and fever. Diagnosis is made through clinical examinations and imaging techniques such as ultrasound or X-ray.
Treatment depends on the cause: antibiotics for bacterial infections, pain relievers, and anti-inflammatory drugs to alleviate symptoms. For abscesses or severe injuries, surgical intervention may be required. Autoimmune diseases are treated with immunosuppressants. The prognosis is generally good if the disease is detected and treated in time. Preventive measures include good oral hygiene, regular veterinary check-ups, and the avoidance of traumas. Long-term research focuses on improving diagnostic and treatment methods as well as developing preventive measures to reduce the risk of sialadenitis.
Causes
The salivary glands are important exocrine glands that produce saliva, which plays a significant role in digestion and oral hygiene. In dogs, there are several salivary glands, including the parotid, mandibular, and sublingual glands. Inflammation of these glands can impair their function and lead to various clinical symptoms.
The main causes of sialadenitis in dogs can be infectious, traumatic, or immunological in nature. Bacterial infections are common, with bacteria entering the glands either through the bloodstream or by direct spread from the mouth. Viral infections can also play a role, although they are less common. Trauma or physical injuries from external influences or following dental procedures also lead to inflammation of the glands.
Autoimmune diseases, where the immune system attacks the body’s own glands, represent another possible cause. More rarely, tumors or cysts can cause inflammation by blocking the salivary ducts or infiltrating the glandular tissue.
Symptoms
Dogs with sialadenitis often show significant swelling in the area of the affected glands, which can be clearly visible from the outside. The swellings are often painful and can cause the dog to feel uncomfortable or turn its head away.
Other symptoms can include fever, lethargy, and loss of appetite. Some dogs also show excessive salivation or difficulty swallowing. In severe cases, abscess formation may occur, which opens through the discharge of pus.
An unusual odor from the mouth or a change in the consistency of the saliva may also indicate inflammation. Occasionally, hardening of the glands can occur, which feel firm to the touch.
Therapy
The therapy for sialadenitis depends on the underlying cause. For bacterial infections, antibiotics are used to fight the pathogens. Pain relievers and anti-inflammatory medications can also be administered to alleviate symptoms.
In cases where an abscess has formed, surgical drainage may be required to remove the pus and promote healing. For traumatic injuries, surgical correction or immobilization may be necessary.
For autoimmune causes, immunosuppressants or corticosteroids can be used to regulate the immune system. In extreme cases where the gland is severely damaged, surgical removal of the affected gland may be necessary.
Prognosis and follow-up care
The prognosis for dogs with sialadenitis varies depending on the cause and severity of the disease. With timely diagnosis and appropriate treatment, the prognosis is generally good, and most dogs recover completely.
In cases where the inflammation is caused by a tumor or a serious autoimmune disease, the prognosis may be more cautious and depend on the response to therapy.
Long-term complications are rare, but chronic cases can lead to permanent changes in the glandular tissue that require ongoing treatment.
Prevention
The prevention of sialadenitis in dogs includes good oral hygiene and regular veterinary check-ups to detect and treat dental problems early. Avoiding traumas to the head and neck area can also be helpful.
In dogs with a known tendency toward autoimmune diseases, regular monitoring and early treatment of symptoms are important to prevent inflammation of the glands.
A balanced diet and the avoidance of infections, for example through vaccinations or hygiene measures, can also help minimize the risk of sialadenitis.
Outlook on current research
Current research on sialadenitis in dogs focuses on various aspects of the disease, including causes, diagnostic methods, and treatment options. A major focus is on identifying the underlying causes that can lead to inflammation of the salivary glands. Scientists are investigating both infectious and non-infectious factors. Infections by bacteria, viruses, or fungi can lead to sialadenitis. Additionally, autoimmune and systemic diseases are being studied as possible causes.
Another major field of research is the improvement of diagnostic methods. Traditionally, the diagnosis is made based on clinical symptoms and examination by a veterinarian. New imaging techniques such as ultrasound or magnetic resonance imaging (MRI) are being studied for their effectiveness and accuracy to enable more precise diagnoses. Molecular diagnostic tests that can identify specific markers for inflammation or infection are also the subject of current studies.
In the area of therapy, both medical and surgical approaches are being investigated. Current studies are testing the effectiveness of newer antibiotics and anti-inflammatory drugs. Researchers are also exploring alternative therapies, such as the use of phytotherapy or acupuncture, to alleviate symptoms and promote healing. Likewise, the role of nutrition and lifestyle changes in the prevention and treatment of sialadenitis is being examined.
In the long term, research aims to develop preventive measures to reduce the risk of sialadenitis. This includes vaccines against specific pathogens that could be linked to the disease, as well as genetic studies to identify susceptible dog breeds or individuals. The hope is that these efforts will help lower the incidence of the disease and improve the quality of life for affected dogs.
Frequently Asked Questions (FAQs)
1. What is sialadenitis in dogs?
2. What symptoms occur with sialadenitis?
3. How is sialadenitis diagnosed?
4. What Treatment Options are Available?
5. Can sialadenitis heal on its own?
6. How can I help my dog recover from sialadenitis?
7. Are there risk factors for developing sialadenitis?
8. How can I reduce the risk of sialadenitis in my dog?
9. Is sialadenitis contagious?
10. What is the prognosis for a dog with sialadenitis?
Literature
- Enache, A. E., Maini, S., Pivetta, M., Jeanes, E., Fleming, L., Hartley, C., & Tetas Pont, R. (2025). Canine bilateral zygomatic sialadenitis: 20 cases (2000–2019). Journal of Small Animal Practice, 66(6), 396–411. https://doi.org/10.1111/jsap.13844
- Yee, D. E., Parambeth, J. C., Kawalilak, L., & Sauvé, C. (2024). Severe bilateral sialadenitis of the mandibular and parotid salivary glands with severe panniculitis in a 2-year-old Standard Poodle. Journal of the American Animal Hospital Association, 60(6), 306–313. https://doi.org/10.1177/08987564241264462
- Story, B. D., Koske, P. H., & others. (2024). Clinical and immunohistochemical manifestations of suspected Sjögren’s disease in a dog. Frontiers in Veterinary Science, 11, Article 1479363. https://doi.org/10.3389/fvets.2024.1479363
- Park, S.-Y., Lee, J.-S., Yoon, H.-Y., Kim, H.-E., & Kim, J.-H. (2022). Different outcomes of multiple sialadenitis involving the submandibular and zygomatic salivary glands in a Welsh Corgi dog. Veterinární Medicína, 67(8), 447–453. https://doi.org/10.17221/174/2020-VETMED
- Pérez-Écija, A., Estepa, J. C., Mendoza, F. J., & others. (2012). Granulomatous giant cell submandibular sialadenitis in a dog. The Canadian Veterinary Journal, 53(11), 1211–1214.
- Lieske, D. E., & Rissi, D. R. (2020). A retrospective study of salivary gland diseases in 179 dogs (2010–2018). Journal of Veterinary Diagnostic Investigation, 32(4), 604–610. https://doi.org/10.1177/1040638720932169
- Spangler, W. L., & Culbertson, M. R. (1991). Salivary gland disease in dogs and cats: 245 cases (1985–1988). Journal of the American Veterinary Medical Association, 198(3), 465–469.