TL;DR: If your cat has a hard abdomen and cannot urinate, they are likely suffering from a life-threatening urethral obstruction that requires immediate emergency veterinary care.
Why does my cat have a hard, swollen abdomen and an inability to urinate?
When a cat has a hard, swollen abdomen and is unable to pass urine, it is most frequently caused by a urethral obstruction. This is a condition where the tube leading from the bladder is blocked by crystals, stones, or inflammatory debris. As urine continues to be produced but cannot be released, the bladder stretches to its limit, causing the abdomen to feel firm and painful.
How urgent is it if my cat cannot pass urine?
- This is a life-threatening medical emergency requiring immediate contact with an emergency veterinarian.
- Toxic waste products and potassium levels rise rapidly in the bloodstream when urine is not released.
- The condition can lead to kidney failure or heart failure within 24 to 48 hours.
- Delaying treatment by even a few hours can significantly change the outcome for your pet.
How can a photo or video help the veterinarian triage my cat?
- A photo or video of your cat's posture or straining in the litter box can confirm signs of distress.
- Images of the genital area help the staff identify localized inflammation.
- This visual information allows the clinic to prioritize your cat the moment you walk through the door.
- Visuals help the veterinary team prepare necessary life-saving equipment in advance of your arrival.
Clinical Context (Merck Veterinary Manual)
Urethral obstruction in cats is an emergency, potentially causing uremia within 36-48 hours and death within 48-72 hours. Initial signs include frequent attempts to urinate, producing a fine stream or nothing, and extreme pain during urination. Complete obstruction leads to depression, anorexia, vomiting, diarrhea, dehydration, and coma. If the bladder is intact, it will be distended, hard, and painful upon palpation; caution is advised to avoid iatrogenic rupture. Bladder rupture can cause temporary pain relief but leads to peritonitis, absorption of uremic toxins and potassium, abdominal distention, cardiac arrhythmias, and death. Hyperkalemia and metabolic acidosis are life-threatening complications. Clinical signs include pollakiuria, stranguria, hematuria, abdominal pain, vomiting, dehydration, hypothermia, and severe depression. Bradycardia or cardiac arrhythmias may be present due to hyperkalemia. Immediate treatment involves relief of obstruction by catheterization and fluid therapy with normal saline.
Chapter: Urology, Emergency
Source: The Merck Veterinary Manual, 11th Edition (Page 1527)