An India-focused guide to prostate enlargement in male dogs covering benign prostatic hyperplasia, infection, cysts, abscesses, cancer, ultrasound and treatment.

Urgent prostate warning signs

Inability to urinate or severe repeated straining
Fever, collapse, vomiting or intense abdominal pain
Blood clots, heavy bleeding or very pale gums
Severe pain when walking, sitting or defecating
Weakness of the hind limbs or sudden deterioration in an older male dog

What the prostate does

The prostate surrounds the urethra near the neck of the bladder and contributes fluid to semen. In sexually intact male dogs, androgen stimulation commonly causes age-related benign enlargement.

Because the canine prostate expands outward as well as around the urethra, signs may involve the colon, urinary tract or reproductive tract. A dog can have significant enlargement before obvious urinary obstruction occurs.

Major causes of prostate enlargement

Condition	Typical context	Possible signs
Benign prostatic hyperplasia (BPH)	Older sexually intact male	Bloody preputial discharge, blood in urine or semen, ribbon stool; sometimes no signs
Acute prostatitis	Bacterial infection, often with systemic illness	Fever, pain, lethargy, urinary infection, discharge
Chronic prostatitis	May accompany BPH	Recurrent urinary infection, infertility or subtle signs
Prostatic cyst or abscess	Complication of gland disease	Pain, fever, large irregular prostate, urinary or faecal difficulty
Prostatic carcinoma	Older intact or neutered male	Weight loss, pain, urinary signs, lameness or neurological signs

How the prostate is evaluated

Examination may include rectal palpation, urinalysis, urine culture, complete blood count and serum chemistry. Transabdominal ultrasound is particularly useful for measuring the gland and assessing texture, cysts, mineralisation and nearby lymph nodes.

Samples may be obtained through prostatic fluid, semen, urine, needle aspiration or biopsy depending on the suspected disease. Recurrent urinary infection in an older intact male should prompt investigation of the prostate rather than repeated antibiotic courses alone.

Important: Do not massage a severely painful prostate or attempt home rectal examination. Acute prostatitis and abscesses can be dangerous and require professional handling.

Benign prostatic hyperplasia

BPH is noncancerous and extremely common in ageing intact males. Castration is the preferred treatment when breeding is not required and usually leads to marked shrinkage. Medical options may be used in selected breeding dogs, but effects, fertility goals and monitoring must be discussed with a reproductive veterinarian.

A diagnosis of BPH should not be made solely from age and intact status. Irregular shape, mineralisation, severe pain or systemic illness raises concern for another process.

Prostatitis and abscesses

Bacterial prostatitis may occur with urinary infection because prostatic fluid can reflux into the bladder. Acute disease can cause fever, severe pain and abscess formation. Chronic infection can be subtle and may relapse if medicine does not penetrate prostatic tissue or if BPH remains.

Treatment uses culture-guided antimicrobial selection, supportive care and management of underlying BPH. Large abscesses may require drainage or surgery. Castration is often recommended when breeding is not essential.

Prostate cancer

Prostatic carcinoma is uncommon but aggressive. Mineralisation in a neutered male, irregular gland margins, enlarged lymph nodes, pelvic pain or unexplained hind-limb lameness may increase suspicion.

Staging may include chest imaging, abdominal ultrasound, CT and tissue diagnosis. Treatment can involve surgery in selected cases, radiation, systemic therapy, pain management or urinary stenting when obstruction occurs.

Home monitoring

Record urine stream, frequency and blood.
Note stool shape and pain during defecation.
Track fever, appetite, weight and activity.
Give antibiotics for the full prescribed duration.
Attend repeat urine culture and ultrasound when requested.
Seek urgent help if the dog cannot urinate.

Can prostate disease be prevented?

Castration prevents or treats androgen-dependent BPH, but it does not prevent every form of prostate disease. Routine senior examinations, prompt culture of urinary infections and investigation of bloody discharge improve early detection.

Dogsvilla practical tip: In boarding records, do not write only 'old male—pees blood sometimes'. Require a diagnosis, current medicine list, emergency threshold and whether urinary obstruction has ever occurred.