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Prostatic Cysts in Dogs

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Cysts in the Prostate


Prostatic cysts in the dog have several associations: changes in the cells brought on by hormonal changes; retention cysts within the prostate that are cavitating (capable of forming a cavity in the tissue or organ); fluid-filled lesions with a distinct capsule (sac-like enclosure); and paraprostatic (close to the prostate) cysts that are cavitating, fluid-filled lesions with a distinct capsule. Prostatic cysts range in diameter from a few millimeters to more than 20 centimeters. Paraprostatic cysts usually arise on top and alongside the prostate, displacing the bladder, or at the back of the prostate in the pelvis. These cysts affect intact male dogs between the ages of two and twelve years, with large dogs more commonly affected than small dogs.


Symptoms and Types


  • Asymptomatic (without symptoms)
  • Lethargy and loss of appetite (anorexia)
  • Abdominal distention (swelling)
  • Constipation, if the cyst compresses the rectum
  • Difficulty urinating, if the cyst compresses the urethra
  • Urethral discharge




  • Benign prostatic enlargement
  • Androgenic hormones
  • Estrogenic hormones




Your veterinarian will perform a thorough physical exam on your pet, taking into account the background history of symptoms and possible incidents that might have precipitated this condition. Several ailments could account for these symptoms, and several diagnostic procedures will be used to determine exactly what is causing them in your dog. A complete blood profile will be conducted, including a chemical blood profile, a complete blood count, and a urinalysis. Fluid from the prostate will be gathered, either by ejaculation, or by prostatic massage, in order to test the fluid for infection. Ultrasound will be used as a visual aid for guiding a fine-needle to the prostrate in order to draw fluid from any cysts. This process is referred to as fine needle aspiration.




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