Why Is My Rabbit Spraying Urine? Causes, Hormones, and Fixes

Urine spraying is usually a marking behavior, not a full bladder emptying. A rabbit may back up to a surface, lift the tail, and shoot a small stream or mist of urine onto a wall, cage side, object, or another animal. Some rabbits also circle feet, honk, mount, or seem unusually excited at the same time.

This pattern is different from normal urination in a litter box. It is also different from urine dribbling caused by urinary disease, obesity, arthritis, or weakness, where urine may collect on the fur around the hindquarters instead of being deliberately aimed.

Hormones are the biggest driver. VCA notes that spayed rabbits are much less likely to show hormone-related behaviors such as urine spraying, territorial marking, mounting, and aggression. Merck Veterinary Manual also notes that intact male rabbits are often neutered for behavioral reasons because they remain in a constant state of libido and may mount or act aggressively.

Territory and social stress matter too. Rabbits may spray when they smell another rabbit, when a new rabbit is introduced, during bonding sessions, after a move, or when routines change. Even rabbits that are already altered may continue some marking if they feel crowded, insecure, or challenged by nearby rabbits.

See your vet immediately if your rabbit is straining to urinate, producing little to no urine, has blood-tinged urine, seems painful, stops eating, or becomes lethargic. VCA lists frequent urination, hunching or straining to urinate, urine staining around the hind end, and blood-tinged urine as signs seen with bladder stones. Bladder sludge can also cause thick, sandy urine, strong odor, dribbling, and urine scald.

Medical causes are more likely if the behavior is new, your rabbit seems uncomfortable, or the urine is leaking rather than sprayed. Rabbits hide pain well, so appetite changes, tooth grinding, reduced activity, or sitting hunched can be important clues.

Male rabbits can begin breeding behavior at about 3 months of age, while females often reach sexual maturity later, commonly around 4 to 6 months depending on the source and individual rabbit. That timing often matches the start of spraying, mounting, circling, and territorial behavior.

Females can spray too, especially if intact or during false pregnancy-type hormonal states. VCA notes that spaying reduces hormone-induced behaviors in female rabbits, including urine spraying and aggression. In both sexes, behavior may take several weeks to improve after surgery because hormone levels do not drop overnight.

Start by managing the environment. Clean marked areas thoroughly with an enzymatic cleaner safe for pets, add or enlarge litter boxes, and place boxes where your rabbit already chooses to urinate. If spraying happens near another rabbit's enclosure, increase visual barriers and give each rabbit separate resources such as litter boxes, hay stations, hides, and feeding areas.

Try to reduce triggers instead of punishing the behavior. Punishment can increase stress and make marking worse. During bonding or introductions, go slowly and use neutral territory. If your rabbit is intact, ask your vet whether spay or neuter is appropriate, since that often reduces hormone-driven spraying substantially.

There is not one single right answer for every rabbit. The best plan depends on whether the spraying is behavioral, medical, or both.

Conservative care
Typical cost range: $40-$150
Includes: home history review, litter box and housing changes, trigger reduction, enzymatic cleaning, separation from rival rabbits, weight and mobility review, and monitoring photos or videos for your vet.
Best for: rabbits with mild, predictable marking behavior and no signs of pain or urinary distress.
Prognosis: fair to good if the behavior is clearly territorial and triggers can be controlled.
Tradeoffs: lower upfront cost, but it may not work well if hormones or urinary disease are driving the problem.

Standard care
Typical cost range: $90-$350 for exam and basic workup; $250-$700 additional if spay or neuter is recommended, depending on region and rabbit sex.
Includes: veterinary exam, discussion of behavior pattern, urinalysis when feasible, abdominal radiographs if urinary disease is suspected, pain assessment, and a plan for behavior modification plus spay or neuter when appropriate.
Best for: most rabbits with new spraying, persistent marking, or any concern for discomfort.
Prognosis: good for hormone-related spraying after appropriate surgery and environmental management; variable if urinary disease is present.
Tradeoffs: more cost and planning, but it helps rule out painful conditions that can mimic behavior problems.

Advanced care
Typical cost range: $400-$1,500+ depending on diagnostics and treatment needs.
Includes: sedated imaging, repeat radiographs, bloodwork, culture, treatment for bladder sludge or stones, hospitalization, surgery for urinary stones when needed, and coordinated behavior planning for multi-rabbit homes.
Best for: rabbits with recurrent signs, blood in urine, straining, urine scald, severe aggression, or suspected bladder stones or sludge.
Prognosis: depends on the underlying cause; many rabbits improve when the medical issue is identified and treated.
Tradeoffs: more intensive and higher cost range, but appropriate for complex or painful cases where basic steps are not enough.

Contact your vet promptly if spraying starts suddenly, gets worse, or is paired with appetite loss, lethargy, tooth grinding, urine scald, strong-smelling thick urine, blood-tinged urine, or straining. Merck advises immediate veterinary attention for bloody urine, discomfort while urinating, or bleeding from the urinary or genital area.

Even if the behavior seems hormonal, a baseline exam is worthwhile when the pattern is new. Rabbits can have both marking behavior and urinary disease at the same time.