TL;DR: If your male dog is straining to urinate without success, it is a life-threatening emergency that requires immediate veterinary care to prevent kidney failure or bladder rupture.
Why is my male dog straining to urinate or defecate?
When a male dog repeatedly squats or postures to eliminate without producing urine or stool, he is experiencing significant distress. This straining is typically referred to as stranguria (straining to urinate) or tenesmus (straining to defecate). In male dogs, this behavior is most frequently associated with a urinary tract issue, such as crystals, stones, or severe inflammation that is obstructing the flow of urine.
Is my dog's inability to urinate a veterinary emergency?
- A complete urinary blockage in a male dog is a life-threatening situation.
- Because the male urethra is long and narrow, it is prone to total obstruction.
- If the bladder cannot empty, toxins normally filtered by the kidneys build up in the blood.
- This buildup can lead to heart failure, kidney damage, or a ruptured bladder within 24 to 48 hours.
- If your dog has been unsuccessful for more than a few hours, you should go to an emergency clinic immediately.
How can photos or videos help my veterinarian diagnose the problem?
- A video allows the vet to observe the specific posture, helping them distinguish between urinary straining and constipation.
- A clear photo of your dog's genital area can reveal swelling, redness, or the presence of small stones or discharge.
- Visual evidence provides vital information for a quick diagnosis and helps the medical team prepare for your arrival.
Clinical Context (Merck Veterinary Manual)
Urethral obstruction is common in male dogs. When evaluating a male dog with frequent, unproductive attempts to urinate, a thorough history should include age of onset, whether the animal is intact or neutered, age at neutering, current medications, and any history of previous urinary tract disorders. Observe the act of voiding, estimating initial and final bladder volume. Animals with mechanical or functional obstruction have a large, distended bladder, but urine cannot be readily expressed; caution must be exercised to avoid rupturing the bladder. Plain or contrast radiographs, cystoscopy, or ultrasonography are necessary to determine the type and location of mechanical obstruction. Urethral obstruction should be considered, and complete radiographic examination of the urinary tract is indicated because multiple uroliths may be present. Urate and occasionally cystine uroliths may be radiolucent, requiring contrast radiography or ultrasonography to confirm their presence. Urinalysis, including identification of crystals and bacterial culture and sensitivity testing, is a critical part of the evaluation and may help determine the type of urolith present. Common diseases of the prostate in intact male dogs, such as benign prostatic hyperplasia, may cause similar clinical signs.
Chapter: Urology
Source: The Merck Veterinary Manual, 11th Edition (Page 1526)