A dog that repeatedly squats without producing urine is almost always experiencing a medical problem, not a behavioral one. The most common causes are urinary tract infections, bladder stones, and bladder inflammation, but a complete blockage of the urethra is also possible and can become fatal within days if untreated. If your dog is straining and producing absolutely no urine, especially alongside vomiting, lethargy, or loss of appetite, this is a veterinary emergency.
Urinary Tract Infections
UTIs are one of the most frequent reasons dogs squat repeatedly with little or no result. Bacteria enter the bladder from outside the body, evade the immune system, and cause infection that inflames the bladder wall. That inflammation makes the bladder feel full even when it isn’t, which is why your dog keeps squatting and may only produce a few drops each time.
Common signs of a UTI include straining to urinate, frequent small amounts of urination, accidents in the house, foul-smelling urine, blood in the urine, and excessive licking of the genital area. Female dogs are more prone to UTIs because of their shorter urethra, but males get them too. A vet can diagnose a UTI with a urine sample, and the infection typically clears with a course of antibiotics.
Bladder Stones and Crystals
Minerals in your dog’s urine can clump together into stones (called uroliths) or form tiny crystals that irritate the bladder lining. Both cause the same frustrating cycle: your dog feels the urge to pee, squats, and produces very little. Stones can also physically block the urethra, especially in male dogs, where the urethra is narrower.
Some types of stones dissolve with a prescription diet, while others need to be surgically removed. Dogs with a history of stones need ongoing monitoring because recurrence is common. If your vet suspects stones, they’ll typically use X-rays or ultrasound to confirm the diagnosis and determine the type.
Urethral Blockage
This is the scenario that requires the most urgency. If the urethra is completely blocked by a stone, tumor, or other obstruction, your dog will strain without producing any urine at all. According to the American College of Veterinary Surgeons, dogs with a total urethral blockage will die within days if it isn’t relieved. Signs of a complete blockage include obvious pain, lethargy, loss of appetite, and vomiting.
There’s also a less common condition called reflex dyssynergia, where the muscles that control the urethra don’t coordinate properly with the bladder. It occurs primarily in middle-aged male dogs of large or giant breeds. The urine stream may start normally but quickly slows to a dribble or stops entirely. Because the symptoms look identical to a physical blockage, a vet visit is the only way to tell the difference.
Prostate Problems in Male Dogs
If your dog is an intact (unneutered) male, an enlarged prostate is a likely culprit. The urethra runs directly through the prostate gland, so when the prostate swells, it squeezes the urethra and makes urination slow and uncomfortable. Dogs with prostate enlargement often spend a long time squatting and produce only a thin stream of urine. Complete blockage is rare with prostate issues, but the straining can look alarming.
Because the prostate also sits just below the colon, a very enlarged gland can cause difficulty with bowel movements too. If your male dog is straining to both urinate and defecate, prostate disease is a strong possibility. Some dogs also show signs of abdominal pain or reluctance to walk. Neutering resolves most cases of benign prostate enlargement, though infections or other prostate diseases may need additional treatment.
Bladder Inflammation Without Infection
Sometimes the bladder becomes inflamed even when there’s no bacterial infection and no stones present. This is called sterile cystitis, and it produces the same symptoms as a UTI: frequent squatting, small amounts of urine, and visible discomfort. The key difference is that antibiotics won’t help because there’s no infection to treat.
Sterile cystitis is better understood in cats, where stress is a major trigger, but dogs can develop non-infectious bladder inflammation too. Identifying and reducing environmental stressors, along with pain management, is typically the approach. Your vet may run a full urinalysis and culture to rule out bacteria before landing on this diagnosis.
Marking Behavior vs. Medical Distress
It’s worth considering whether your dog is actually trying to empty their bladder or simply marking territory. Urine marking is a normal behavior where dogs deliberately release small amounts of urine in multiple spots to signal ownership or relieve stress. It looks purposeful and calm, often directed at vertical surfaces, new objects, or favorite spots.
Medical straining looks very different. Watch for blood in the urine, visible pushing or straining, crying out in pain while attempting to pee, foul-smelling urine, or urinating in unusual locations like near the door or in the middle of the floor. If your dog seems distressed, is squatting more frequently than usual, or appears to be pushing hard without results, that points toward a medical issue rather than marking.
What Happens at the Vet
Your vet will start by asking about changes in how much water your dog drinks, how often they urinate, what the urine looks like, and how your dog has been behaving recently. They’ll also want to know about current medications, appetite changes, and any recent weight loss or illness.
During the physical exam, the vet will feel your dog’s bladder and kidneys, examine the genitalia, and sometimes perform a rectal exam to check the urethra and, in males, the prostate. If there’s any suspicion of a nerve-related problem affecting bladder control, a neurologic exam may follow.
Urinalysis is the cornerstone test. It measures urine concentration, acidity, and cloudiness, and checks for blood, protein, sugar, bacteria, and crystals under a microscope. If infection is suspected, the vet may collect urine directly from the bladder using a needle through the abdomen, which gives the cleanest sample for a bacterial culture. Depending on results, X-rays or ultrasound may be needed to look for stones, tumors, or structural problems. Blood tests can also reveal kidney issues or other systemic problems contributing to urinary difficulty.