Emergencies Cats
Male cat straining to pee? Why it's an emergency
A male cat going to the litter box again and again with little or no urine may be blocked — fatal within days without treatment. Signs, causes, treatment and prevention.
Key takeaways
- Straining with little or no urine in a male cat = emergency. Don't wait until morning.
- Blocked cats can die within 1–3 days.
- Treatment is unblocking under anaesthesia, then fluids and hospital care.
- More water (wet food, fountains), weight control and calm homes help prevent it.
On this page
If your male cat is straining in the litter box and little or nothing is coming out, call 01783-121256 and come in now. This is one of the most time-critical emergencies in cats.
Why it’s so dangerous
When the urethra blocks, urine can’t leave the bladder. Within hours the bladder becomes painfully swollen; within a day or two, toxins and potassium build up in the blood. High potassium stops the heart. Without treatment, a fully blocked cat usually dies within 24 to 72 hours.
Signs
- Going to the litter box again and again
- Straining with little or no urine — often mistaken for constipation
- Crying or growling while trying to urinate
- Licking the genital area
- Urinating in unusual places
- Blood in the urine
- Later: vomiting, hiding, weakness, collapse
Why it happens
- Crystals (often struvite) forming a gritty plug
- Mucus plugs of inflammatory material
- Stones from the bladder
- Feline idiopathic cystitis — bladder inflammation often triggered by stress
Risk factors include being male, overweight, indoor, inactive, eating only dry food, drinking little, and stress — a new pet, a move, conflict with another cat.
Treatment
- Stabilise — fluids and correcting dangerous potassium levels.
- Unblock under sedation or anaesthesia, and place a urinary catheter.
- Hospital care for a few days: fluids to flush the kidneys, pain relief and monitoring.
- Tests — urine analysis and blood work to find the cause and check kidney function.
- For cats that block repeatedly, surgery (perineal urethrostomy) may be recommended.
At home afterwards
- Give all medicines as prescribed — pain relief and muscle relaxants help prevent re-blocking.
- Watch the litter box closely. Any straining again = call us immediately.
- Follow the diet advice. Urinary diets can dissolve some crystals.
Prevention
- More water: add wet food, add water to meals, use wide bowls or a fountain, place water away from food.
- Healthy weight: use our food calculator with the “neutered adult” setting.
- Clean litter boxes: one more box than the number of cats, scooped daily.
- Less stress: hiding places, play time, and slow introductions of new pets.
Not sure whether it’s urgent? Our symptom checker treats urinary straining in male cats as an emergency — and so should you.
This guide is general information, not a diagnosis. If your pet is unwell, call us or visit a registered veterinarian.
Frequently asked questions
How do I know if my cat is constipated or blocked?
It's hard to tell by watching, and the difference is life or death. Check the litter for urine clumps — if there are few or none, or if you're unsure, treat it as a blockage and come in.
Why are male cats more likely to get blocked?
Male cats have a much longer, narrower urethra that crystals, mucus plugs and small stones can easily lodge in.
Can a urinary blockage come back?
Yes, recurrence is common, especially in the first weeks. A special diet, more water, weight loss and stress reduction lower the risk. Some cats need surgery if it keeps happening.
Does dry food cause urinary blockage?
Not directly, but cats on dry food alone drink less and make more concentrated urine. Adding wet food or water to meals helps.