Prostate Inflammation in Dogs (Prostatitis)

  • Occurrence: common
  • Location of disease: Abdomen/pelvis
Author: Dr. med. vet. Gisa Löwe | Last modified: 08.08.2026
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If the condition worsens / symptoms persist, consult a veterinarian.

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Definition

Prostatitis is an inflammation of the prostate gland in dogs, often caused by bacterial infections, which can lead to a variety of symptoms that affect the well-being and health of the affected dog.

Das Wichtigste auf einen Blick

Prostatitis in dogs is an inflammation of the prostate, often caused by a bacterial infection. The prostate, a gland near the bladder, plays an important role in sperm production. In older, uncastrated dogs, the prostate can grow, increasing the risk of inflammation. Common bacteria causing prostatitis include Escherichia coli, Staphylococcus, and Streptococcus. Traumas, urinary reflux, autoimmune diseases, or tumors can also be causes.

Symptoms include weakness, loss of appetite, difficulty passing stool and urine, Fever, and Abdominal pain. Blood in the urine or purulent discharge are also possible. Diagnosis is made through clinical examination, blood and urine tests, and, if necessary, ultrasound.

Treatment depends on the cause. Bacterial infections are treated with antibiotics. In the case of underlying prostatic hyperplasia, castration can help reduce the risk of recurrent inflammation. Pain relievers and anti-inflammatory drugs alleviate the symptoms. In severe cases, surgery may be necessary. The prognosis is usually good with timely treatment, especially for bacterial infections.

Prevention includes castration, regular veterinary check-ups, and a healthy lifestyle. A balanced diet and regular exercise contribute to prostate health. If noticeable symptoms occur, a veterinarian should be consulted to allow for quick diagnosis and treatment.

Ursachen

The prostate is a small gland located near the bladder that plays an important role in the production of seminal fluid. In uncastrated dogs, the prostate can grow with age, which is known as benign prostatic hyperplasia (BPH). This enlargement can encourage the development of prostatitis.

One of the most common causes of prostatitis in dogs is a bacterial infection. Bacteria can enter the gland via the urinary tract, the blood, or through direct contact with the prostate. Commonly involved bacteria include Escherichia coli, Staphylococcus, and Streptococcus. In some cases, an infection with mycoplasmas or fungi can also lead to inflammation.

In addition to infections, prostatitis can also be caused by traumas, such as injuries in the pelvic area or urinary reflux. In rarer cases, autoimmune diseases or tumors can also play a role.

Symptoms

Rare symptoms:

Symptoms of prostatitis can vary and often depend on the severity of the inflammation. Acute prostatitis often leads to sudden Fever, pelvic pain, difficulty urinating, and occasionally blood in the urine. Affected dogs may also appear lethargic and lose their appetite.

In chronic prostatitis, symptoms may be less pronounced but persist long-term. These include recurrent urinary tract infections, persistent lower abdominal pain, and possibly an abnormal gait. Some dogs also show changes in behavior, such as Irritability or withdrawal.

Diagnose

The diagnosis of prostatitis usually begins with a thorough clinical examination, during which the veterinarian performs a rectal palpation of the prostate. Attention is paid to the size, shape, and consistency of the prostate.

In addition, blood and urine tests are performed to identify signs of inflammation and potential infectious agents. A urine culture can help isolate specific bacteria causing the inflammation. In some cases, an ultrasound of the prostate may also be recommended to detect structural changes or Abscesses.

Therapie

Treatment for prostatitis depends on the cause. For bacterial infections, antibiotics are typically used and must be administered over a longer period to ensure complete recovery. The choice of antibiotic depends on the type of bacteria identified in the culture.

In cases where prostatitis is caused by another underlying condition such as BPH, castration of the dog may be considered to reduce the risk of recurrence. Pain relievers and anti-inflammatory medications may also be prescribed to alleviate symptoms.

In severe cases, especially if Abscesses or other complications occur, surgery may be required to relieve the prostate or remove affected tissue.

Prognose und Nachsorge

The prognosis for dogs with prostatitis depends on the cause and severity of the condition. With timely diagnosis and appropriate treatment, the prognosis is generally good, especially if the inflammation is due to a treatable bacterial infection.

Chronic prostatitis can be more difficult to treat and may require longer-term medical care. Dogs suffering from an underlying condition like BPH can benefit from castration, which significantly reduces the risk of recurrence.

Prävention

One of the most effective measures for preventing prostatitis in dogs is castration, especially in older males who are more susceptible to prostate enlargement. By reducing hormonal influences, the risk of inflammation and other prostate problems can be reduced.

Regular veterinary check-ups are also important to detect early signs of prostate enlargement or inflammation. If symptoms such as increased urination, blood in the urine, or pain occur, a veterinarian should be consulted immediately to enable early diagnosis and treatment.

A balanced diet and a healthy body weight can also help lower the risk of prostate problems. Regular exercise and avoiding being Overweight are important factors contributing to the dog’s general health.

Ausblick auf aktuelle Forschung

Prostatitis is not a single disease entity, but a collective term for various inflammatory conditions and symptom patterns of the prostate. These include acute and chronic bacterial forms, but also chronic prostatitis/chronic pelvic pain syndrome (CP/CPPS), where often no clear bacterial cause can be detected. This is precisely why modern research focuses mainly on which biological mechanisms underlie the respective subforms. (ncbi.nlm.nih.gov, pubmed.ncbi.nlm.nih.gov)

The most important research outlook today concerns better subdivision and precision diagnostics. Especially in CP/CPPS, it is increasingly assumed that not only infections, but also immune responses, nerve sensitivity, pelvic floor dysfunction, and possibly the microbiome play a role. Therefore, biomarkers, more differentiated clinical phenotypes, and new imaging or laboratory approaches are being investigated to categorize patients more specifically. (pubmed.ncbi.nlm.nih.gov, pubmed.ncbi.nlm.nih.gov)

A second focus is individualized therapy. Instead of a uniform scheme, a multimodal approach is increasingly coming to the fore, which combines antibiotics, anti-inflammatory strategies, pelvic floor treatment, pain therapy, and other procedures depending on the subform. Research is attempting to develop reliable prediction criteria for this. (uroweb.org, pubmed.ncbi.nlm.nih.gov)

Overall, the outlook is good: research is clearly moving away from the blanket diagnosis of “prostatitis” toward a biologically more precise classification and more individual therapy concepts.

Frequently Asked Questions (FAQs)

1. What is prostatitis?
Prostatitis is an inflammation of the prostate gland. It can be acute or chronic and is usually caused by bacterial infections, often ascending from the urethra. It affects almost exclusively uncastrated, mostly older male dogs with prostatic hyperplasia.
2. Which pathogens are most common?
By far the most common pathogens are Escherichia coli, followed by Staphylococci, Streptococci, Klebsiella, Proteus, and Mycoplasma. Fungi or Brucella canis are involved more rarely. An antibiogram from prostatic fluid or urine is very important for targeted therapy.
3. What symptoms do affected dogs show?
In acute prostatitis, Fever, apathy, Vomiting, painful urination and defecation, a tense abdomen, and often purulent discharge from the prepuce occur. The chronic form is more subtle, with recurrent urinary tract infections, blood in the urine or seminal fluid, and occasional fertility disorders.
4. How is the diagnosis made?
Rectal examination shows an enlarged, painful prostate. Blood counts and inflammatory markers are often altered. Crucial steps include a urine culture, possibly a prostatic wash or ejaculate examination with germ count determination, and a prostate ultrasound, which visualizes the structure and distinguishes between hyperplasia, abscess, and tumor.
5. How is prostatitis treated?
Central to treatment is antibiotic therapy with an active ingredient that effectively crosses the prostate barrier, such as enrofloxacin, marbofloxacin, or trimethoprim-sulfonamide. The duration of therapy is four weeks for the acute form and at least six to eight weeks for chronic prostatitis. Accompanying castration is almost always indicated in recurrent cases.
6. Why is castration so important?
Castration shrinks the prostate by about 50 percent within a few weeks and eliminates the androgen-dependent hyperplasia that provides a major basis for bacterial colonization. Without castration, recurrences are common. Alternatively, medical chemical castration with GnRH agonists can be performed.
7. What is a prostatic abscess?
In a prostatic abscess, pus collects in encapsulated cavities within the prostate. This leads to severe general symptoms and can lead to life-threatening peritonitis if a rupture occurs. In addition to antibiotics, treatment requires surgical drainage with omentalization or ultrasound-guided aspiration.
8. Can prostatitis affect fertility?
Yes, chronic inflammation leads to changes in semen quality, reduced sperm motility, and can cause long-term infertility. In breeding dogs, prostate disease should always be ruled out if fertility problems occur.
9. How do you distinguish prostatitis from prostate cancer?
Both can cause similar symptoms. Prostate carcinoma is rather rare in dogs but also occurs in castrated males and is often malignant. Ultrasound with fine-needle aspiration or biopsy clarifies the diagnosis. A second opinion from an oncologist is recommended for any unclear prostate imaging.
10. What is the prognosis?
In cases of acute prostatitis and timely treatment, the prognosis is good. Chronic prostatitis and prostatic abscesses require longer-term, consistent therapy, but the prognosis is also good with castration. In contrast, prostate carcinoma has a significantly poorer prognosis.

Literatur

  • Weese, J. S., Blondeau, J., Boothe, D., Guardabassi, L. G., Gumley, N., Papich, M., Jessen, L. R., Lappin, M., Rankin, S., Westropp, J. L., & Sykes, J. (2019). International Society for Companion Animal Infectious Diseases (ISCAID) guidelines for the diagnosis and management of bacterial urinary tract infections in dogs and cats. The Veterinary Journal, 247, 8–25. https://doi.org/10.1016/j.tvjl.2019.02.008
  • Lea, C., Walker, D., Blazquez, C. A., & Kelly, D. (2022). Prostatitis and prostatic abscessation in dogs: Retrospective study of 82 cases. Australian Veterinary Journal, 100(6), 223–229. https://doi.org/10.1111/avj.13150
  • Palmieri, C., & Grieco, V. (2022). A review on canine and feline prostate pathology. Frontiers in Veterinary Science, 9, 881232. https://doi.org/10.3389/fvets.2022.881232
  • Christensen, B. W. (2018). Canine prostate disease. Veterinary Clinics of North America: Small Animal Practice, 48(4), 701–719. https://doi.org/10.1016/j.cvsm.2018.02.012
  • Ruetten, H., Wehber, M., Murphy, M., Cole, C., Sandhu, S., Oakes, S., Bjorling, D., Waller, K., III, Viviano, K., & Vezina, C. (2021). A retrospective review of canine benign prostatic hyperplasia with and without prostatitis. Clinical Theriogenology, 13(4), 360–366.
  • Polisca, A., Troisi, A., Fontaine, E., Menchetti, L., & Fontbonne, A. (2016). A retrospective study of canine prostatic diseases from 2002 to 2009 at the Alfort Veterinary College in France. Theriogenology, 85(5), 835–840. https://doi.org/10.1016/j.theriogenology.2015.10.030