You clean your rabbit's litter box and notice the urine is red — or orange, or rust-colored. Panic sets in. Is your bunny bleeding internally? The short answer is: probably not. Red urine in rabbits is often completely normal and harmless. But sometimes it does indicate a real problem, and knowing how to tell the difference is crucial.
The Good News: Most Red Rabbit Urine Is Porphyrin Pigment
Rabbits naturally excrete compounds called porphyrins — pigments derived from the normal breakdown of red blood cells — through their urine. Certain foods rich in pigments trigger stronger porphyrin coloring, turning urine red, orange, rust, or even brownish. Foods associated with red urine include:
- Carrots and carrot tops
- Spinach and other dark leafy greens
- Berries
- Certain herbs (like parsley)
- Broccoli
The color usually returns to normal within 1–3 days, though some rabbits take longer. If your rabbit is eating well, active, and shows no other symptoms, this type of red urine is very likely nothing to worry about.
How to Tell the Difference Between Porphyrin and Blood
Porphyrin (normal):
- Urine is a uniform, consistent red or orange throughout
- No blood clots or streaks
- Color appears regardless of location in litter box
- Rabbit is eating, drinking, and behaving normally
Blood (hematuria — needs vet attention):
- Urine may have visible blood clots or streaks rather than uniform color
- Blood may appear at the beginning or end of urination
- May be accompanied by straining, crying, or frequent attempts to urinate
- Rabbit may seem uncomfortable, lethargic, or lose appetite
The Hydrogen Peroxide Test
A quick home test: place a drop of the colored urine on a paper towel and add a drop of hydrogen peroxide. If it foams, it contains blood. Porphyrin pigment will not react. This isn't perfectly definitive but can help you decide whether to call the vet.
What Causes Actual Blood in Rabbit Urine?
When hematuria is genuine, the most common causes include:
Uterine Cancer or Infection
Unspayed female rabbits are at very high risk for uterine adenocarcinoma — studies suggest that 60–80% of unspayed females over age 4 will develop uterine cancer. Blood in urine (actually from the uterus) can be an early sign. Spaying eliminates this risk entirely and is strongly recommended.
Bladder Stones or Sludge
Calcium deposits can accumulate in the bladder, causing irritation, bloody urine, straining, and pain. Rabbits on high-calcium diets (excessive pellets, kale, or dairy treats) are at higher risk.
Urinary Tract Infection
UTIs can cause hematuria alongside frequent urination, straining, and wet fur around the genital area.
Kidney Disease
Bleeding from the kidneys, while less common, can occur due to kidney disease or trauma.
When to See an Exotic Vet
Always seek care from a rabbit-savvy exotic vet — not all general practice vets are experienced with rabbit urinary health.
See a vet if:
- Blood appears to be actual blood (clots, streaks, hydrogen peroxide test positive)
- Your rabbit is straining to urinate or producing very little urine
- The rabbit is unspayed and over 3 years old with any bloody discharge
- Red urine persists for more than a week
- Any change in appetite, energy, or litter box habits alongside color change
What To Do at Home
- Note what your rabbit has eaten in the past 24–48 hours — did anything with red pigment appear in the diet?
- Collect a urine sample in a clean container if possible — bring it to the vet appointment.
- Do the hydrogen peroxide test if you're unsure.
- Get unspayed females spayed — this is the single best preventive step for rabbit health.
Normal vs. Abnormal Urine Colors in Rabbits
Rabbit urine varies far more than most pet owners expect. The normal range includes:
- Yellow to amber — the most common healthy color
- Orange — often normal, may relate to diet or hydration
- Red to rust — frequently normal porphyrin pigment
- White to chalky — indicates calcium carbonate excretion, common in rabbits; not usually concerning in small amounts
- Dark brown — occasionally seen, often from concentrated urine; worth monitoring
Colors that should prompt concern regardless of cause: bright red with clots or streaks, cloudy white with gritty texture, or any color change accompanied by straining, reduced eating, or lethargy.
How Voyage Can Help
Voyage AI Vet can help you assess whether your rabbit's red urine needs urgent exotic vet care — starting at $4.99/month. Get an instant assessment anytime, day or night.
This article is for informational purposes only and is not a substitute for professional veterinary advice. For exotic pets, always consult a vet with exotic animal experience.