Rabbit fly strike (cutaneous myiasis) is a rapidly fatal emergency in which blowfly larvae burrow into skin around the perineum, releasing tissue-destroying enzymes; affected rabbits may go from normal to critically ill within 12–24 hours. Female intact rabbits over age 5, and any rabbit with soiled hindquarters or diarrhea, are at highest risk — especially during warm weather.
Last reviewed: June 2026
What is fly strike in rabbits?
Fly strike (cutaneous myiasis) occurs when blowflies — most commonly Lucilia sericata (the green bottle fly) in the UK, and Calliphora or Cochliomyia species in North America — lay eggs on soiled, moist, or damaged skin. The eggs hatch in 12–24 hours. The larvae (maggots) then burrow into living tissue, secreting enzymes that liquefy flesh and allow rapid, deep penetration. What begins as a small wound can become life-threatening in under 24 hours — without immediate veterinary care, fly strike is often fatal.
A 2018 study of 42,226 rabbit consultations in Great Britain found that blowfly strike led to euthanasia or death in 45% of affected rabbits (Turner et al., 2018, Preventive Veterinary Medicine). This is not a condition to monitor at home.
What are the signs of fly strike in rabbits?
Early signs (first 12–24 hours after egg-laying):
- Restlessness or agitation — the rabbit grooms frantically at the perineum or hindquarters
- Visible fly eggs — tiny white specks or clusters, like grains of rice, on fur around the tail, genitals, or skin folds
- Wet or matted fur around the hindquarters
- Foul odor from the affected area
Signs of established infestation (larvae burrowing):
- Visible maggots — cream-colored, wriggling larvae in matted fur or visible skin wounds
- Skin wounds, ulceration, or necrosis (black/gray discolored skin) around the perineum, belly, or skin folds
- Sudden lethargy — the rabbit that was alert becomes huddled and still
- Hunched posture and reluctance to move
- Loss of appetite; refusal of favorite foods
- Teeth grinding (bruxism) or a "tooth-purr" — signs of pain in rabbits
- In severe cases: collapse, hypothermia, and shock
Important: Many rabbits hide early signs until they are critically ill. Finding even one or two maggots means hundreds may already be present and burrowing.
Which rabbits are at highest risk?
The Turner et al. 2018 study identified clear risk factors (Turner et al., 2018, Preventive Veterinary Medicine):
| Risk factor | Relative risk increase |
|---|---|
| Age ≥5 years | >3.8× more likely vs younger rabbits |
| Intact (unneutered) female | 3.3× more likely vs neutered female |
| Every 1°C rise in temperature | 33% increase in risk |
| Perineal soiling (diarrhea, urine scald) | Major predisposing factor |
Other risk factors include: obesity (cannot groom perineum), dental disease (causes loose droppings), arthritis (limits self-grooming), dirty or damp living conditions, and skin wounds.
What should I do if I find maggots on my rabbit?
This is a veterinary emergency. Call your vet or an exotic/emergency vet immediately.
While arranging emergency transport:
- Do not panic and do not attempt to remove deeply embedded maggots yourself — you may cause additional trauma
- Gently place the rabbit in a carrier with a towel; keep it warm (hypothermia is common)
- Do not put the rabbit in water to "wash out" maggots — this causes further shock
- Call ahead so the vet can prepare emergency analgesia and treatment
Your vet will clip and examine the full wound area, remove all visible and buried larvae under sedation or anesthesia, debride necrotic tissue, provide fluid therapy for shock, administer pain relief and antibiotics, and assess the depth and extent of tissue damage.
How is fly strike prevented in rabbits?
- Daily perineal checks — every morning from spring through autumn, part the fur around the tail, genitals, and skin folds and look for eggs, maggots, or soiled fur
- Keep the hutch clean — remove soiled bedding daily; wet bedding is a fly magnet
- Treat diarrhea and cecotrope imbalance — sticky droppings or diarrhea are the single biggest attractant for blowflies; address the root cause (diet, dental disease, GI disease)
- Neuter intact females — eliminates the hormonal discharge that attracts flies and significantly reduces risk
- Body condition monitoring — obese rabbits cannot groom their perineum; maintain a healthy weight
- Fly screens on hutches during peak fly season (warm weather)
- Veterinary-prescribed insecticides/repellents — such as cyromazine (Rearguard) in the UK, applied topically to the hindquarters; ask your exotic vet about products approved in your region
For rabbits as described in Quesenberry & Carpenter's Ferrets, Rabbits & Rodents: Clinical Medicine and Surgery, preventive perineal examination and husbandry modification are the most effective interventions.
When to See a Vet
Call your vet today if:
- You find any fly eggs (tiny white specks) on your rabbit's fur around the perineum or tail
- Your rabbit's hindquarters are wet, soiled, or smell unusually foul
- Your rabbit has become less active, is hunching, or has stopped eating — with concurrent perineal changes
- You find even one maggot — this is a full emergency, not a wait-and-see situation
Go to the ER immediately if:
- You find multiple maggots burrowing in your rabbit's skin — this is a life-threatening emergency requiring treatment within hours
- Your rabbit is collapsed, hypothermic (cold ears and feet), or unresponsive
- The skin around the perineum appears darkened, necrotic, or has open wounds
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Frequently Asked Questions
How fast does fly strike kill a rabbit? Fly strike can be fatal within 24–48 hours of egg-laying in severe cases. The larvae destroy tissue rapidly and the toxins released can cause shock and organ failure. This is why the 45% death/euthanasia rate was recorded even in rabbits that reached a vet — early detection is critical.
Can fly strike happen indoors? Yes, though it is less common. Flies can enter through open windows and doors. Any rabbit with soiled hindquarters or a skin wound is vulnerable indoors. Daily perineal checks are essential regardless of where the rabbit lives.
What does fly strike smell like? A characteristic sweet, foul, or putrid odor — sometimes described as "rotting" — develops as tissue necrosis progresses. If you notice an unexplained bad smell near your rabbit's enclosure, examine the perineal area immediately.
What does the treatment for fly strike cost? Emergency treatment for fly strike typically costs $500–2,000 depending on severity. Anesthesia, wound debridement, hospitalization for fluids and pain management, and follow-up care all contribute. Severe cases with deep tissue damage may require multiple debridement procedures. Preventing fly strike — through daily checks and hutch hygiene — is far less costly.
Can my rabbit recover from fly strike? Yes, if caught early and treated aggressively. Rabbits with superficial maggot infestations caught within the first few hours and receiving immediate veterinary care have the best outcomes. Rabbits with deep tissue involvement, systemic shock, or delayed treatment have a significantly guarded to poor prognosis.
Still Not Sure if Your Rabbit Needs a Vet?
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