TL;DR: An inability to urinate after a fall is a life-threatening emergency that requires immediate veterinary care to prevent fatal complications like heart failure or kidney rupture.
Why is my cat unable to urinate after a fall?
- Inability to urinate is a very serious sign typically indicating a ruptured bladder, a physical blockage caused by internal trauma, or neurological damage.
- Injuries to the spine or pelvis can compromise the nerves that signal the bladder to contract, leading to a dangerous and painful buildup of urine.
Is it a veterinary emergency if my cat cannot pee after an accident?
- Yes, this is a High-Urgency Emergency because metabolic waste and potassium levels rise rapidly, which can lead to heart failure or kidney rupture within 24 to 48 hours.
- You must transport your cat to an emergency veterinarian immediately if they are straining at the litter box, crying in pain, or have a distended abdomen.
How can taking a photo help the veterinarian triage my cat?
- A photo or video of your cat's "straining" posture helps the triage team distinguish between constipation and a critical urinary emergency.
- Images showing abdominal bruising or small drops of bloody urine allow the vet to assess the severity of the trauma before you even arrive at the clinic.
Clinical Context (Merck Veterinary Manual)
Urethral obstruction in cats is an emergency requiring immediate treatment. Following a fall, if a cat exhibits frequent attempts to urinate producing only a fine stream, a few drops, or nothing, urethral obstruction should be suspected. Complete obstruction can cause uremia within 36-48 hours, leading to anorexia, vomiting, dehydration, coma, and death within 48-72 hours. A distended, hard, and painful bladder suggests obstruction, while inability to palpate the bladder may indicate rupture, although urine may or may not be obtained via abdominocentesis. Hyperkalemia and metabolic acidosis are life-threatening complications. Initial emergency care includes immediate relief of obstruction via catheterization and fluid therapy with normal saline. An ECG to assess cardiac rhythm and serum potassium levels are indicated. Inability to urinate can be caused by mechanical obstruction or neurologic disease, potentially leading to bladder overdistention and overflow incontinence.
Chapter: Urology, Emergency
Source: The Merck Veterinary Manual, 11th Edition (Page 1527)