If your cat is straining in the litter box and not producing urine, stop reading and call an emergency vet right now. A urinary obstruction—commonly called a “blocked cat”—is one of the most life-threatening emergencies we see at Dogwood Veterinary Specialty and Emergency. Without treatment, a blocked cat can die within 24 to 48 hours.

We understand how frightening it is to see your cat in distress. This article will help you recognize the warning signs of feline urinary obstruction, understand why it is so dangerous, and know exactly what to do. If you are in the Marietta, Georgia area, Dogwood is here for you and your cat around the clock.

A urinary obstruction occurs when something blocks the urethra—the narrow tube that carries urine from the bladder to the outside of the body. When this tube is blocked, urine backs up into the bladder and eventually into the kidneys. The blockage is typically caused by a plug of mucus, crystals, or small bladder stones that lodges in the urethra.

Male cats are overwhelmingly the most at risk. This is because a male cat’s urethra is significantly longer and narrower than a female cat’s, making it far easier for material to become stuck. While female cats can occasionally develop urinary obstructions, the vast majority of blocked cats seen in emergency veterinary hospitals are males—particularly young to middle-aged neutered males.

Several factors can increase the likelihood of a urinary blockage, including a diet high in minerals (especially magnesium), inadequate water intake, stress, obesity, and a sedentary indoor lifestyle. Cats who have had one episode of urinary obstruction are at higher risk for recurrence.

Signs Your Cat May Be Blocked

Recognizing the symptoms of a urinary obstruction early can save your cat’s life. Watch for these warning signs:

• Straining to urinate: Your cat crouches in the litter box for extended periods, pushing and straining but producing little or no urine. This is the most common and most critical sign.
• Crying or vocalizing in the litter box: Painful attempts to urinate often cause cats to meow, yowl, or cry out while in or near the litter box.
• Frequent trips to the litter box: A blocked cat may visit the litter box repeatedly—sometimes every few minutes—without producing urine. Many owners initially mistake this for constipation.
• Urinating outside the litter box: A cat peeing outside the litter box, especially in unusual places like the bathtub or on cool tile, may be desperately trying to relieve the pressure in a blocked bladder.
• Excessive licking of the genital area: Cats instinctively lick areas that are painful or irritated. If your cat is persistently grooming around the penis or urinary opening, take notice.
• Hiding or withdrawing: Cats in pain often retreat to quiet, isolated spots. If your normally social cat is suddenly hiding under the bed or in a closet, pain could be the cause.
• Vomiting: As toxins build up in the bloodstream due to the kidneys’ inability to filter waste, nausea and vomiting often follow.
• Lethargy and weakness: A blocked cat may become progressively weak, unresponsive, or even collapse. This signals a late-stage emergency—the cat is in critical danger.

If you notice even one or two of these symptoms—especially straining with no urine output—do not wait to see if it improves on its own. A urinary obstruction will not resolve without veterinary intervention.

Why Every Minute Counts

A urinary obstruction is not a condition that can wait until morning or until your regular vet opens on Monday. It is a true, time-sensitive emergency. Here is why:

Within hours of a complete blockage, the bladder becomes painfully distended. Pressure builds and the kidneys can no longer filter waste products from the blood.

Within 24 to 48 hours, potassium levels in the blood can rise to dangerously high levels—a condition called hyperkalemia. Elevated potassium directly affects the heart’s electrical system and can cause fatal cardiac arrhythmias. At the same time, the kidneys begin to fail as they are unable to excrete toxins. Uremia (a buildup of waste products in the blood) sets in, causing nausea, vomiting, and neurological depression.

Beyond 48 hours, the risk of death increases dramatically. The bladder may rupture, the heart may stop, or irreversible kidney damage may occur. Cats who survive a prolonged blockage may face chronic kidney disease for the rest of their lives.

The message is simple: if your cat can’t pee, it is an emergency. The sooner your cat receives treatment at an emergency vet, the better the outcome.

What to Expect at Dogwood Veterinary Specialty and Emergency

When you arrive at Dogwood with a blocked cat, our emergency veterinary team will act quickly. Here is a general overview of the treatment process:

• Triage and Stabilization. Your cat will be assessed immediately. We will check vital signs, palpate the bladder, and draw blood to evaluate kidney function, electrolyte levels (especially potassium), and overall organ health. If potassium levels are dangerously high, we will begin intravenous (IV) fluids and medications to stabilize the heart before proceeding.
• Urinary Catheter Placement. Under sedation or general anesthesia, our team will pass a urinary catheter through the urethra to relieve the blockage and drain the bladder. This is a delicate procedure, as the urethra is inflamed and the obstruction must be carefully flushed out. The catheter is typically sutured in place and left for 24 to 72 hours to allow the urethra to recover and to ensure urine continues to flow freely.
• Bloodwork and Monitoring. Your cat will be hospitalized on IV fluids to flush toxins from the body and support the kidneys. We monitor bloodwork repeatedly to track kidney values and electrolytes as they return to normal. Most cats require two to three days of hospitalization.
• Surgery for Recurrent Cases. If your cat has experienced multiple urinary obstructions, our veterinary surgeons may recommend a procedure called a perineal urethrostomy (PU surgery). This surgery creates a wider urinary opening, significantly reducing the risk of future blockages. It is a well-established, highly effective procedure performed routinely by our surgical team at Dogwood.

Recovery and Aftercare

After your cat is discharged from Dogwood, recovery typically takes one to two weeks. Here is what you can do at home to support your cat and reduce the risk of another blockage:

• Prescription diet: Your veterinarian will likely recommend a urinary-specific diet formulated to dissolve crystals, maintain proper urine pH, and discourage stone formation. Follow this recommendation closely—diet is one of the most important tools for prevention.
• Increase water intake: Encourage your cat to drink more water by providing a pet water fountain, adding water to wet food, or feeding primarily canned (wet) food. Dilute urine is far less likely to form crystals and plugs.
• Reduce stress: Stress is a known trigger for feline lower urinary tract disease. Provide multiple clean litter boxes, vertical spaces, and a calm environment. Pheromone diffusers may also help.
• Monitor litter box habits: Pay close attention to how often your cat urinates and how much urine is in the litter box. Any sign of straining, decreased urine output, or blood in the urine warrants an immediate call to your veterinarian.
• Follow-up appointments: Keep all recommended recheck appointments so your vet can monitor your cat’s urinary health and adjust the treatment plan as needed.

Do Not Wait. Call Dogwood Now.

If your cat is straining to urinate, crying in the litter box, or has not produced urine in several hours, please do not take a wait-and-see approach. A blocked cat is a medical emergency, and every hour of delay increases the risk of permanent damage or death.

Dogwood Veterinary Specialty and Emergency is open 24 hours a day, 7 days a week, including all holidays. Our emergency vet team in Marietta is ready to help your cat right now. Call us at (404) 609-1234 or drive directly to our hospital at 1234 Powers Ferry Common SE, Marietta, GA 30067.

Your cat is counting on you to act fast. We are here to help.