Myiasis (flystrike) is rapid maggot infestation of a rabbit's perineal area, usually starting in soiled fur and progressing to live maggots eating into the skin within 24 hours. Untreated, it kills via toxic shock. Daily tail-end checks during warm months and addressing any cause of urine or fecal soiling are the only reliable prevention.
Last reviewed: May 2026
How Flystrike Develops in Hours
Female flies (most commonly Lucilia sericata, the green bottle fly) are attracted to soiled fur, broken skin, and the smell of urine or soft feces. They lay clusters of eggs on the rabbit's perineum, tail base, or any wound. Eggs hatch into maggots within 8 to 24 hours in warm weather. The first-instar maggots begin feeding on dead skin and exudate, but within another 24 hours they secrete proteolytic enzymes that liquefy and digest healthy tissue. By 48 to 72 hours, deep wounds with hundreds of active maggots are typical.
The reason flystrike is so fast is the cascade — bacterial toxins from the damaged tissue plus maggot secretions trigger systemic toxic shock. Affected rabbits become hypothermic, weak, and collapse within 24 to 48 hours of significant infestation. Mortality is high once systemic signs appear.
Risk Factors That Set Rabbits Up
Anything causing chronic perineal soiling is a major risk. Obesity that prevents grooming, arthritis or spondylosis preventing the rabbit from reaching the tail, severe dental disease causing soft cecotrope production, diarrhea, urinary tract disease, and dirty hutches all dramatically increase risk. Long-coated breeds and rabbits with heavy dewlap folds are also at higher risk because fur traps moisture.
Outdoor or hutch-housed rabbits are at highest risk. Indoor rabbits are not immune — flies enter through windows and screens — but rates are much lower. Risk peaks May through September in temperate climates, though year-round risk exists in warmer regions per AEMV Pet Care Guides, 2024.
Early Signs Before Maggots Appear
The first signs are subtle: damp or matted fur around the tail, a fly that won't leave the rabbit alone, slight restlessness, or excessive grooming of the perineum. Many rabbits stop eating before any maggots are visible. The owner who checks the rabbit's bottom daily catches infestations at the pre-maggot or fly-egg stage — small clusters of cream-colored eggs in the fur — when treatment is straightforward.
Once visible maggots are present, signs include obvious open wounds with crawling maggots, severe lethargy, hunched posture, refusal to eat, and a foul smell. By the time wounds are deep or the rabbit is collapsed, you are in emergency territory.
Same-Day Treatment Is Mandatory
Treatment cannot wait for the next-available appointment — every hour of maggot activity worsens tissue damage. Initial treatment is sedation or anesthesia, clipping the affected fur, manual removal of every visible maggot, lavage with warm saline, and topical or systemic application of an insect growth regulator. Cyromazine (Rearguard) and ivermectin or selamectin are both used. Imidacloprid plus permethrin combinations are NOT safe in rabbits — many small-animal flea products contain permethrin, which is toxic to rabbits at low doses.
Systemic care includes IV or subcutaneous fluids, analgesics (meloxicam plus opioid for severe cases per pain management literature including Benato et al., 2019, JSAP), broad-spectrum antibiotics, syringe feeding, and warming if hypothermic. Wound care continues for days to weeks depending on depth. Rabbits with extensive tissue loss may need staged surgical debridement or referral.
Cost is significant — emergency exotic ER visit alone runs $250 to $500, sedation and treatment another $500 to $1,500, and hospitalization $300 to $800 per day. The full bill commonly exceeds $1,500 for an established case.
Prevention That Actually Works
The single most important prevention is daily perineal checks during warm months. Lift the rabbit, part the fur around the tail and anus, and look for soiling, broken skin, eggs, or moisture. Address any cause of soiling — weight loss if obese, dental treatment if cecotropes are abnormal, deeper hutch cleaning, treatment of diarrhea, switching to fly-screened housing.
Preventive cyromazine applied to the perineum every 8 to 10 weeks during fly season provides 8 to 10 weeks of protection by preventing fly larvae from developing. Diet management — appropriate hay-forward feeding with limited pellets and sugary treats — keeps cecotropes firm and reduces soiling. Hutch screening and fly traps reduce environmental fly load.
When to See a Vet
Visible maggots, eggs, or unexplained perineal soiling during warm months are urgent. Don't bathe the rabbit and watch overnight — go in.
Call your vet today if:
- Wet, matted, or soiled fur around the tail base
- A fly that keeps landing on the perineum
- Soft cecotropes sticking to the back end
- Slight lethargy or partial appetite loss in warm weather
- Visible fly eggs in the fur
Go to the ER immediately if:
- Any visible maggots
- Open wounds with bleeding or pus
- Collapse, profound lethargy, or hypothermia
- Refusal to eat or move for more than 6 hours
- A rabbit that's hunched, cold, and unresponsive
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Frequently Asked Questions
How much does flystrike treatment cost?
Emergency exotic vet visit with sedation, fur clipping, manual maggot removal, and initial wound treatment runs $400 to $1,000. Hospitalization for 24 to 72 hours adds $300 to $800 per day. Severe cases needing prolonged wound care, surgical debridement, or referral can exceed $2,000 to $4,000. Prevention with cyromazine is dramatically cheaper at $20 to $40 per season.
How fast does flystrike kill a rabbit?
Untreated, severe flystrike kills within 24 to 48 hours from toxic shock and tissue damage. Maggots can liquefy and digest healthy tissue within hours of hatching. Even mild infestations that look superficial can progress rapidly. Emergency treatment within hours of recognition dramatically improves survival.
Can I just bathe my rabbit and remove the maggots at home?
No. Home removal misses maggots that have burrowed into tissue, and bathing a stressed rabbit risks hypothermia and shock. Sedation is needed to safely clip fur, find and remove all maggots, and apply appropriate insecticidal treatment. Home delay also misses the systemic supportive care that affected rabbits need.
How can I prevent flystrike during summer?
Daily perineal checks during warm months are essential. Fix any cause of perineal soiling — weight loss in obese rabbits, dental treatment for soft cecotropes, deeper hutch cleaning. Apply preventive cyromazine to the perineum every 8 to 10 weeks during fly season for protection. House rabbits indoors or in fly-screened housing when possible.
Still Not Sure if Your Rabbit Needs a Vet?
When you're not sure if this is wait-and-see or call-tonight, Voyage AI Vet triages in under 2 minutes. Describe what you're seeing in chat, share photos of the tail area, any visible maggots, and the rabbit's overall posture, or hop on a live video call if you want a second pair of eyes. Every answer comes with citations to the actual veterinary literature it's pulling from — so you see exactly where the guidance comes from, not just a chatbot's word.