If your male cat is going in and out of the litter box, straining, and producing little or no urine, don’t wait to see if it resolves on its own. This is one of the few true “call now, don’t wait until morning” emergencies in cat medicine.
Why Male Cats Are at Much Higher Risk
Male cats have a longer, narrower urethra than females. When crystals, inflammation, or a mucus plug develop in the bladder (a condition broadly called feline lower urinary tract disease, or FLUTD), that narrow passage is far more likely to become completely blocked. Female cats can develop the same underlying bladder inflammation, but they’re much less likely to become fully obstructed because of their wider, shorter anatomy.
Symptoms of a Blocked Cat
Because the signs look a lot like straining to defecate, this emergency is frequently mistaken for constipation. Watch for:
- Frequent trips to the litter box with little or no urine produced
- Straining or crying while in the litter box
- Excessive licking at the genital area
- Urinating outside the litter box (on the floor, in the sink, in the tub)
- Vomiting, lethargy, or hiding
- A hard, painful, distended abdomen
- In advanced cases, collapse
If you see straining with no urine—even once—treat it as an emergency until proven otherwise.
Why This Can’t Wait
A fully blocked bladder is fatal if it isn’t relieved. As urine backs up, it can rupture the bladder, and the buildup of potassium in the bloodstream can trigger a fatal heart arrhythmia—sometimes within 24 to 48 hours of the blockage starting. There is no home remedy or “wait and see” option here. This is a same-day, go-now situation.
What Treatment Involves
A blocked cat needs to be seen immediately. Treatment typically involves:
- Sedation and placement of a urinary catheter to relieve the blockage
- IV fluids to correct dehydration and flush out toxins
- Bloodwork to check kidney function and potassium levels, with heart monitoring if levels are dangerously high
- Hospitalization for 24–72 hours to allow bladder inflammation to settle and confirm the cat can urinate normally once the catheter is removed
Cats who block once are at meaningfully higher risk of blocking again. If a cat blocks repeatedly, your vet may recommend a surgical procedure called a perineal urethrostomy (PU surgery), which widens the urethral opening to reduce future risk.
What Increases the Risk
- Being overweight
- Indoor-only, sedentary lifestyle
- Stress (new pets, moves, changes in routine)
- Diets low in moisture (dry food only)
- Multi-cat households with litter box competition
Reducing the Risk Going Forward
- Feed wet food, or add water to dry food, to increase overall moisture intake
- Provide multiple litter boxes (the general rule is one per cat, plus one extra) kept clean
- Add a cat water fountain—many cats drink more from moving water
- Reduce household stress where possible
- Ask us about a prescription urinary diet if your cat has blocked before or has a history of crystals
When to Call
Any male cat straining in the litter box with little or no urine output needs to be seen immediately—not at the next available routine appointment. If it’s outside our office hours, go straight to an emergency vet.
See straining with no urine? Call Poplar View Pet Hospital right away at 901-457-7315. If it’s after hours, please head directly to the nearest emergency veterinary hospital—this isn’t one to wait on.
