TL;DR: Pink or red urine in cats indicates blood and requires immediate veterinary evaluation to rule out life-threatening urinary blockages. Seek emergency care if your cat is straining, vocalizing, or unable to pass urine.
What does it mean if my cat has pink or red urine?
Finding pink or red-tinted urine in your cat's litter box typically indicates the presence of blood (hematuria). Common causes include:
- Urinary tract infections (UTIs)
- Feline idiopathic cystitis
- Urinary crystals and bladder stones
Is pink or red urine in my cat a veterinary emergency?
We categorize pink or red urine as a high-priority situation. It is often the first sign of a dangerous urinary blockage, especially in male cats. Seek emergency care immediately if your cat is:
- Straining in the litter box
- Vocalizing while attempting to urinate
- Producing little to no urine
- At risk of kidney failure from a life-threatening blockage
Why does taking a photo of my cat's urine help the veterinarian?
Visual evidence and tracking behavior help our team triage the urgency level more accurately. If possible, please do the following:
- Take a clear photo of urine on light-colored surfaces or puppy pads
- Note how many times the cat is visiting the box
- Share these details to help determine the concentration of blood and provide a baseline for monitoring
Clinical Context (Merck Veterinary Manual)
In cats presenting with pink or red urine (hematuria), potential causes include feline lower urinary tract disease (FLUTD) associated conditions such as urinary tract infection, neoplasia, trauma, urethral plugs, urolithiasis, and sterile cystitis (feline interstitial cystitis). Urolithiasis should be suspected based on clinical signs of hematuria, dysuria, or urethral obstruction. Diagnostic steps include urinalysis, urine culture, radiography, and ultrasonography to differentiate uroliths from other causes. Radiography, cystoscopy, or ultrasonography are crucial for detecting uroliths, as abdominal palpation is unreliable. If clinical signs or urinalysis suggest infection, a urine culture and antimicrobial susceptibility test are recommended, ideally from a sample collected via cystocentesis or sterile urethral catheterization.
Chapter: Urology
Source: The Merck Veterinary Manual, 11th Edition (Page 1531)