Chronic Inflammation of the Oral Mucosa in Dogs (Chronic Ulcerative Paradental Stomatitis, CUPS)
- 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
Chronic ulcerative paradental stomatitis (CUPS) is a painful inflammation of the oral cavity in dogs, characterized by chronic ulcers and inflammatory conditions affecting the gums, lips, and oral mucosa. It is often associated with an overreaction of the immune system to dental plaque.
The most important facts at a glance
Chronic ulcerative paradental stomatitis (CUPS) in dogs is an inflammatory disease of the oral cavity in which the immune system reacts excessively to the bacteria in dental plaque. The exact cause of this reaction is unclear, but genetic factors could play a role, as certain breeds like Cocker Spaniels are more susceptible. Symptoms include gingivitis, painful oral ulcers, increased salivation, and unpleasant bad breath. Diagnosis requires a thorough clinical examination, teeth cleanings, and possibly biopsies to rule out other diseases. Treatment aims to alleviate symptoms and control inflammation, often through teeth cleaning, antibiotics, and anti-inflammatory medications. In severe cases, tooth extractions may be necessary. The prognosis depends on the treatment, and regular dental care and veterinary check-ups are crucial for prevention. Research focuses on genetic predispositions, the oral microbiome, and the development of new therapies to enable less invasive treatment options and improve the quality of life for affected dogs.
Causes
A dog’s oral cavity harbors a variety of bacteria that normally exist in a healthy balance. In CUPS, however, the dog’s immune system appears to react excessively to the presence of these bacteria. The exact cause of this immune system overreaction is not yet fully understood, but it is believed that genetic factors may play a role.
Some dog breeds appear to be more susceptible to CUPS, including Cocker Spaniels, Cavalier King Charles Spaniels, and other smaller breeds. This suggests that certain genetic predispositions may increase the risk. It is believed that the immune system of these dogs reacts more sensitively to the bacteria in dental plaque, leading to a chronic inflammatory response.
The inflammation that occurs in CUPS is the result of an immune-mediated reaction to plaque and tartar (calculus). These substances consist of bacteria and their metabolic products that accumulate on the teeth. In dogs with CUPS, the immune system appears to recognize these substances as a threat and triggers an inflammatory response to combat them. However, this response can be excessively strong and lead to the painful ulcers that are characteristic of the disease.
Other possible causes associated with the development of CUPS include systemic diseases such as diabetes mellitus or autoimmune diseases, which can affect the immune system overall and increase the dog’s susceptibility to inflammatory conditions.
Symptoms
The symptoms of CUPS are often very noticeable and painful for the affected dog. One of the most common symptoms is bad breath (halitosis), caused by bacterial infection and tissue decay. This bad breath is often very intense and unpleasant.
Another noticeable symptom is excessive drooling, caused by pain and inflammation in the mouth. Dogs with CUPS may also show difficulty eating, as the pain makes chewing and swallowing difficult. This can lead to a decreased appetite and weight loss.
Red, inflamed, and ulcerative areas are often visible in the affected dog’s mouth, particularly along the gum lines and on the oral mucosa. These ulcers can bleed and are extremely painful when touched.
Other symptoms may include restlessness, irritability, and a general deterioration in the dog’s well-being, as the constant source of pain causes significant stress.
Therapy
The treatment of CUPS requires a multi-stage approach that aims to relieve symptoms and control the underlying inflammation. One of the first measures is thorough cleaning of the teeth to remove plaque and Tartar (calculus), as these are the main triggers of the inflammatory response.
Antibiotics may be prescribed to treat secondary bacterial infections that frequently occur with CUPS. Furthermore, anti-inflammatory medications, such as corticosteroids, can be used to reduce the inflammatory response and alleviate pain.
In severe cases, it may be necessary to extract some or all of the dog’s teeth to drastically reduce the bacterial load in the oral cavity and control the inflammation. This radical measure can often lead to a significant improvement in symptoms.
In addition to veterinary treatment, special diets and oral care products can be used to support dental health and minimize plaque formation.
Prognosis and follow-up care
The prognosis for dogs with CUPS varies depending on the severity of the disease and the effectiveness of the treatment. In many cases, the condition can be successfully controlled if the diagnosis is made early and treatment is carried out consistently.
Dogs requiring tooth extraction often show a dramatic improvement in quality of life, as the source of pain is removed and the inflammation subsides. However, the removal of many teeth can affect food intake, requiring dietary adjustments.
Since CUPS is a chronic condition, lifelong monitoring and care are necessary to prevent relapses and ensure the dog’s well-being.
Prevention
The most important measure for the prevention of CUPS is consistent dental hygiene. Regular tooth brushing and the use of special oral care products can help prevent the accumulation of plaque and tartar (calculus), which are the main triggers of the disease.
Regular veterinary check-ups and professional teeth cleanings are also important to monitor the condition of the teeth and gums and to intervene early if signs of inflammation or other problems appear.
For dogs with a genetic predisposition for CUPS, it may be helpful to consider special dietary measures that promote oral health and support the immune response.
Outlook on current research
Chronic ulcerative paradental stomatitis (CUPS) in dogs is a complex and challenging disease that continues to be the subject of intensive research. Scientists and veterinarians are striving to better understand the exact causes and mechanisms of this inflammatory disease. It is currently suspected that CUPS is an overreaction of the immune system to the normal bacterial flora in the dog’s mouth. Current research focuses include investigating the genetic predisposition that could make some dog breeds more susceptible to this condition.
Another area of research deals with the role of the oral microbiome. Scientists are investigating how the balance of bacteria in the mouth can influence the occurrence and severity of CUPS. This research could offer new approaches for preventive treatment or symptom relief by specifically altering the microbiome.
Additionally, the development of new therapies is being explored. While removal of the affected teeth is often the most effective treatment method, researchers are looking for less invasive alternatives. These include immunomodulators designed to regulate the immune system’s response, as well as new anti-inflammatory medications. These could help improve the quality of life for affected dogs without the need for extensive tooth extractions.
There are also studies focusing on nutrition and its influence on CUPS. Researchers are investigating whether certain diets can reduce inflammation or if dietary supplements are useful. These studies are still in the early stages but could provide valuable insights in the long term.
Collaboration between veterinarians, dentists, and immunologists is crucial to comprehensively understand the mechanisms of CUPS and develop better treatment strategies. Through the exchange of knowledge and the application of the latest scientific methods, researchers hope to sustainably improve the quality of life for dogs with CUPS.
Frequently Asked Questions (FAQs)
1. What is Chronic Ulcerative Paradental Stomatitis (CUPS) in dogs?
2. What are the symptoms of dogs with CUPS?
3. Which dog breeds are most commonly affected by CUPS?
4. How is CUPS diagnosed?
5. What are the treatment options for dogs with CUPS?
6. Can CUPS be cured?
7. What role does nutrition play in the treatment of CUPS?
8. Are regular follow-up appointments with the veterinarian necessary?
9. Can home remedies help in the treatment of CUPS?
10. How can I help my dog live with CUPS?
Literature
- Ford, J., Bell, C., Donovan, T. A., & Martel, D. (2025). Surgical outcomes in canine lymphoplasmacytic stomatitis: A retrospective study of 42 dogs (2012–2022). Frontiers in Veterinary Science, 12, Article 1681133. https://doi.org/10.3389/fvets.2025.1681133
- Ford, K. R., Anderson, J. G., Stefan, B. L., Murphy, B. G., Kumar, T. K. S., Archer, T., Mackin, A. J., & Wills, R. W. (2023). Medical management of canine chronic ulcerative stomatitis using cyclosporine and metronidazole. Journal of Veterinary Dentistry, 40(2), 109–124. https://doi.org/10.1177/08987564221148755
- Anderson, J. G. (2023). Canine oral lesions: A decision-tree approach to ulcers, leukoplakia, and pigmented lesions. Journal of the American Veterinary Medical Association, 261(S2), S62–S69. https://doi.org/10.2460/javma.23.05.0294
- Anderson, J. G., Kol, A., Bizikova, P., Stapleton, B. P., Ford, K., Villarreal, A., Jimenez, R. J., Vasilatis, D., & Murphy, B. G. (2020). Immunopathogenesis of canine chronic ulcerative stomatitis. PLOS ONE, 15(1), Article e0227386. https://doi.org/10.1371/journal.pone.0227386
- Anderson, J. G., Peralta, S., Kol, A., Kass, P. H., & Murphy, B. G. (2017). Clinical and histopathologic characterization of canine chronic ulcerative stomatitis. Veterinary Pathology, 54(3), 511–519. https://doi.org/10.1177/0300985816688754
- Boutoille, F., & Hennet, P. (2011). Maxillary osteomyelitis in two Scottish Terrier dogs with chronic ulcerative paradental stomatitis. Journal of Veterinary Dentistry, 28(2), 96–100. https://doi.org/10.1177/089875641102800206
- Gracis, M., Reiter, A. M., & Ordeix, L. (2018). Management of selected non-periodontal inflammatory, infectious and reactive conditions. In A. M. Reiter & M. Gracis (Eds.), BSAVA manual of canine and feline dentistry and oral surgery (4th ed., pp. 172–195). BSAVA.
- Merck Veterinary Manual. (2024). Oral inflammatory and ulcerative disease in small animals. Merck & Co. https://www.msdvetmanual.com/digestive-system/diseases-of-the-mouth-in-small-animals/oral-inflammatory-and-ulcerative-disease-in-small-animals
- Ford, J., Bell, C., Donovan, T. A., & Martel, D. (2025). Surgical outcomes in canine lymphoplasmacytic stomatitis: A retrospective study of 42 dogs (2012–2022). Frontiers in Veterinary Science, 12, Article 1681133. https://doi.org/10.3389/fvets.2025.1681133
- Ford, K. R., Anderson, J. G., Stapleton, B. L., Murphy, B. G., Kumar, T. K. S., Archer, T., Mackin, A. J., & Wills, R. W. (2023). Medical management of canine chronic ulcerative stomatitis using cyclosporine and metronidazole. Journal of Veterinary Dentistry, 40(2), 109–124. https://doi.org/10.1177/08987564221148755
- Anderson, J. G. (2023). Canine oral lesions: A decision-tree approach to ulcers, leukoplakia, and pigmented lesions. Journal of the American Veterinary Medical Association, 261(S2), S62–S69. https://doi.org/10.2460/javma.23.05.0294
- Anderson, J. G., Kol, A., Bizikova, P., Stapleton, B. P., Ford, K., Villarreal, A., Jimenez, R. J., Vasilatis, D., & Murphy, B. G. (2020). Immunopathogenesis of canine chronic ulcerative stomatitis. PLOS ONE, 15(1), Article e0227386. https://doi.org/10.1371/journal.pone.0227386
- Anderson, J. G., Peralta, S., Kol, A., Kass, P. H., & Murphy, B. G. (2017). Clinical and histopathologic characterization of canine chronic ulcerative stomatitis. Veterinary Pathology, 54(3), 511–519. https://doi.org/10.1177/0300985816688754
- Boutoille, F., & Hennet, P. (2011). Maxillary osteomyelitis in two Scottish Terrier dogs with chronic ulcerative paradental stomatitis. Journal of Veterinary Dentistry, 28(2), 96–100. https://doi.org/10.1177/089875641102800206
- Gracis, M., Reiter, A. M., & Ordeix, L. (2018). Management of selected non-periodontal inflammatory, infectious and reactive conditions. In A. M. Reiter & M. Gracis (Eds.), BSAVA manual of canine and feline dentistry and oral surgery (4th ed., pp. 172–195). BSAVA.
- Merck Veterinary Manual. (2024). Oral inflammatory and ulcerative disease in small animals. Merck & Co. https://www.msdvetmanual.com/digestive-system/diseases-of-the-mouth-in-small-animals/oral-inflammatory-and-ulcerative-disease-in-small-animals