Staph Infections in Dogs (Staphylococcal Infections)
- Occurrence: common
- Location of disease: General/Whole body
When to visit the vet?
Non-urgent see a veterinarian within 2–3 days
If the condition worsens / symptoms persist, consult a veterinarian.
Definition
Infections caused by Staphylococcus species in dogs are bacterial infections caused by bacteria of the genus Staphylococcus and can affect the skin, ears, or other parts of the body.
The most important facts at a glance
Staphylococcus species are gram-positive bacteria that normally occur harmlessly on the skin and mucous membranes of dogs. If the immune system is weakened or the skin is damaged, these bacteria can cause infections, such as pyoderma or ear infections. Common causes of such infections include allergic skin diseases, skin injuries, and hormonal disorders. Symptoms include Fever, skin Pustules, and infections of the ears or respiratory tract. The diagnosis is made through clinical examinations and laboratory tests to determine the exact bacterial species. Treatment usually includes antibiotics and topical treatments; treating underlying diseases is also important. The prognosis is usually good if the infection is detected and treated early. Long-term complications can occur if underlying problems are not treated. Preventive measures include a balanced diet, regular grooming, and treating allergies or skin conditions. Research focuses on bacterial resistance mechanisms, the development of new diagnostic and treatment methods, and the potential development of vaccines. Environmental factors and the microbial balance of the skin also play a role in the prevention of infections.
Causes
Staphylococcus species are gram-positive bacteria that often occur as harmless commensals on the skin and mucous membranes of dogs. They are round bacteria arranged in grape-like clusters, which is where their name comes from (staphylos is the Greek word for grape). These bacteria are part of the normal skin flora and usually do not cause problems as long as the dog’s immune system is strong and the skin barrier remains intact.
There are several Staphylococcus species, with Staphylococcus pseudintermedius being the most common in dogs. However, these bacteria can become opportunistic, meaning they take advantage of situations where the immune system is weakened or the skin is damaged by injuries or other skin conditions to cause infections. Such an infection can result in pyoderma, otitis externa (ear infection), or other systemic infections.
The causes of staphylococcal infections in dogs are varied. Such infections are often secondary and develop due to pre-existing conditions or a weakened immune system. Common predisposing factors include allergic skin diseases such as atopic dermatitis or flea allergies, skin injuries, excessive Scratching or biting, and hormonal disorders such as hypothyroidism. Stress, an unhealthy diet, and inadequate grooming can also increase the risk of infection. For more information on staphylococcal infections in dogs, see here.
Symptoms
The Symptoms of a staphylococcal infection in dogs depend on the type and location of the infection. In the case of Skin infections, redness, Pustules, Itching, Hair loss, and crusting are often observed. The skin may appear greasy or scaly, and an unpleasant odor may occur. In more severe or deeper infections, Abscesses or open Wounds can develop.
In the case of an ear infection (otitis externa), dogs may show signs of ear pain, such as shaking their head or Scratching their ear. An unpleasant odor and the presence of Discharge from the ear are also common Symptoms. In systemic infections, Fever, loss of appetite, lethargy, and enlarged lymph nodes may occur.
It is important to recognize the symptoms early to avoid complications and initiate appropriate treatment.
Therapy
The treatment of staphylococcal infections in dogs depends on the severity and location of the infection, as well as the underlying causes. In most cases, antibiotics are used to treat a bacterial infection. The selection of the correct antibiotic is often based on the results of culture and sensitivity testing to avoid resistance and maximize effectiveness.
topical treatments such as antibacterial shampoos or ointments can be particularly helpful for superficial Skin infections. These products help reduce the bacterial load on the skin and promote healing. For ear infections, special ear drops or rinses may be required to combat the infection and keep the ear canals clean.
In addition to combating the infection, it is important to treat underlying problems that could predispose to it. This may include treating allergies, hormonal imbalances, or nutritional deficiencies. Regular grooming and cleaning of the skin, as well as strengthening the immune system through a balanced diet and, if necessary, supplements, can also be helpful.
Prognosis and follow-up care
The prognosis for dogs with staphylococcal infections is generally good, provided the infection is detected early and treated appropriately. Superficial Skin infections and mild ear infections often respond well to treatment and heal within a few weeks.
More severe or deeper infections may require longer and more intensive treatment. In such cases, it is important to continue treatment and follow the veterinarian’s instructions closely to avoid relapses and ensure the infection is completely eradicated.
Long-term complications or recurring infections can occur if underlying problems are not addressed. Therefore, it is important to identify and treat predisposing factors to improve the dog’s overall health and well-being.
Prevention
The prevention of staphylococcal infections in dogs focuses on strengthening the dog’s general health and immune system, as well as minimizing predisposing factors. A balanced and nutrient-rich diet is crucial for maintaining a strong immune system and a healthy skin barrier.
Regular grooming and cleaning of the skin, especially in dogs with long or dense fur, help prevent the accumulation of dirt and bacteria. This can be achieved through regular bathing with suitable shampoos and brushing the coat. Regularly checking and cleaning the ears can also help prevent ear infections.
It is important to watch for signs of allergies or other skin conditions and treat them early to reduce the risk of secondary bacterial infections. Stress reduction and providing a safe and clean environment also contribute to the dog’s general health.
Regular veterinary examinations are also important to detect and treat health problems early. The veterinarian can provide specific recommendations for care, nutrition, and health prevention tailored to your dog’s individual needs.
Outlook on current research
Research into infections caused by Staphylococcus species in dogs is a dynamic and constantly evolving field. A key focus is on investigating resistance mechanisms, particularly in methicillin-resistant Staphylococcus aureus (MRSA) strains. The development of MRSA strains has significantly complicated the treatment of staphylococcal infections, as these resistant bacteria are insensitive to many conventional antibiotics. Researchers are working to understand the genetic basis of these resistances in order to develop new therapeutic approaches and control the spread of resistant strains in the animal population.
Another important area of research is the development of new diagnostic methods. Rapid and precise diagnosis tests are crucial to ensure timely treatment and prevent the spread of infections. Researchers are investigating the use of molecular techniques such as polymerase chain reaction (PCR) to quickly identify specific Staphylococcus strains and determine their resistance profiles.
In addition, intensive research is being conducted into the development of new vaccines to strengthen the immune system of dogs against staphylococcal infections. Although there are currently no widely available vaccines against Staphylococcus in dogs, preclinical studies show promising results. These vaccines aim to stimulate the immune response in dogs, thereby better protecting them from infections.
Another research approach investigates the role of the microbiota, i.e., the natural microbial communities, on the skin and in the digestive tract of dogs. It is being investigated how a healthy microbial balance can help reduce the risk of staphylococcal infections. There is evidence that probiotic treatments that promote the growth of beneficial bacteria can reduce the risk of infection.
The importance of environmental factors in the epidemiology of staphylococcal infections is also being investigated. Researchers are analyzing how factors such as living conditions, hygiene practices, and diet can influence the risk of infection. These findings could lead to improved prevention strategies that reduce the risk of outbreaks in households and communities.
Overall, current research focuses on better understanding the mechanisms of resistance development, developing new diagnostic and treatment approaches, and devising practical prevention strategies. The hope is that these efforts will help minimize the impact of staphylococcal infections on the health of dogs and their owners.
Frequently Asked Questions (FAQs)
1. What are staphylococcal infections in dogs?
2. How are staphylococcal infections in dogs diagnosed?
3. What Symptoms occur with staphylococcal infections?
4. How are staphylococcal infections in dogs treated?
5. Can my dog transmit a staphylococcal infection to humans?
6. How can I reduce the risk of a staphylococcal infection for my dog?
7. Can a staphylococcal infection in dogs disappear on its own?
8. Are all staphylococcal infections in dogs resistant to antibiotics?
9. How long does it take for a staphylococcal infection in dogs to heal?
10. Is it possible for my dog to get sick again after a staphylococcal infection?
Literature
- Loeffler, A., Cain, C. L., Ferrer, L., Nishifuji, K., Varjonen, K., Papich, M. G., Guardabassi, L., Frosini, S. M., Barker, E. N., & Weese, J. S. (2025). Antimicrobial use guidelines for canine pyoderma by the International Society for Companion Animal Infectious Diseases (ISCAID). Veterinary Dermatology, 36(3), 234–282. https://doi.org/10.1111/vde.13342
- Hillier, A., Lloyd, D. H., Weese, J. S., Blondeau, J. M., Boothe, D., Breitschwerdt, E., Guardabassi, L., Papich, M. G., Rankin, S., Turnidge, J. D., & Sykes, J. E. (2014). Guidelines for the diagnosis and antimicrobial therapy of canine superficial bacterial folliculitis. Veterinary Dermatology, 25(3), 163–e43. https://doi.org/10.1111/vde.12118
- Morris, D. O., Loeffler, A., Davis, M. F., Guardabassi, L., & Weese, J. S. (2017). Recommendations for approaches to meticillin-resistant staphylococcal infections of small animals: Diagnosis, therapeutic considerations and preventative measures. Veterinary Dermatology, 28(3), 304–e69. https://doi.org/10.1111/vde.12444
- Bannoehr, J., & Guardabassi, L. (2012). Staphylococcus pseudintermedius in the dog: Taxonomy, diagnostics, ecology, epidemiology and pathogenicity. Veterinary Dermatology, 23(4), 253–266, e51–e52. https://doi.org/10.1111/j.1365-3164.2012.01046.x
- van Duijkeren, E., Catry, B., Greko, C., Moreno, M. A., Pomba, M. C., Pyörälä, S., Ružauskas, M., Sanders, P., Threlfall, E. J., Torren-Edo, J., Törneke, K., & Scientific Advisory Group on Antimicrobials. (2011). Review on methicillin-resistant Staphylococcus pseudintermedius. Journal of Antimicrobial Chemotherapy, 66(12), 2705–2714. https://doi.org/10.1093/jac/dkr367
- Perreten, V., Kadlec, K., Schwarz, S., Grönlund Andersson, U., Finn, M., Greko, C., Moodley, A., Kania, S. A., Frank, L. A., Bemis, D. A., Franco, A., Iurescia, M., Battisti, A., Duim, B., Wagenaar, J. A., van Duijkeren, E., Weese, J. S., Fitzgerald, J. R., Rossano, A., & Guardabassi, L. (2010). Clonal spread of methicillin-resistant Staphylococcus pseudintermedius in Europe and North America: An international multicentre study. Journal of Antimicrobial Chemotherapy, 65(6), 1145–1154. https://doi.org/10.1093/jac/dkq078
- Frank, L. A., & Loeffler, A. (2012). Meticillin-resistant Staphylococcus pseudintermedius: Clinical challenge and treatment options. Veterinary Dermatology, 23(4), 283–291, e56. https://doi.org/10.1111/j.1365-3164.2012.01047.x
- Pires Dos Santos, T., Damborg, P., Moodley, A., & Guardabassi, L. (2016). Systematic review on global epidemiology of methicillin-resistant Staphylococcus pseudintermedius: Inference of population structure from multilocus sequence typing data. Frontiers in Microbiology, 7, Article 1599. https://doi.org/10.3389/fmicb.2016.01599
- Lynch, S. A., & Helbig, K. J. (2021). The complex diseases of Staphylococcus pseudintermedius in canines: Where to next? Veterinary Sciences, 8(1), Article 11. https://doi.org/10.3390/vetsci8010011
- Nocera, F. P., & De Martino, L. (2024). Methicillin-resistant Staphylococcus pseudintermedius: Epidemiological changes, antibiotic resistance, and alternative therapeutic strategies. Veterinary Research Communications, 48, 3505–3515. https://doi.org/10.1007/s11259-024-10508-8