Flystrike in Alpacas: Warning Signs, Prevention, and Treatment
Flystrike is one of those health problems that every alpaca owner should understand, even if they have never encountered it in their own herd. While it is more commonly associated with sheep, alpacas can also be affected, and the consequences can be serious if it goes unnoticed.
Flystrike can develop surprisingly quickly, particularly during warm, humid weather when flies are active. Wounds, damaged skin, and areas of fleece contaminated with urine or feces can attract flies looking for somewhere to lay their eggs. Once the eggs hatch, the resulting maggots feed on material around the wound and irritate and damage the surrounding skin. As the infestation progresses, it can cause extensive tissue damage, secondary infection, and, in severe cases, life-threatening illness.
One of the challenges is that early signs are not always obvious.
The good news is that there are practical steps that can be taken to reduce the risk. Regular health checks, good pasture management and prompt attention to wounds or soiled fleece all play an important role.
What Is Flystrike?
Flystrike, also known as myiasis, occurs when certain species of flies lay eggs on an animal's skin or in a suitable moist, damaged, or contaminated area. These eggs hatch into maggots, which begin feeding on damaged tissue and material around the affected area.
As the infestation develops, the larvae can irritate and damage the skin, creating wounds that may attract additional flies. Secondary bacterial infections and more extensive tissue damage can follow.
Although flystrike is less commonly discussed in alpacas than in sheep, it should never be dismissed as a sheep-only problem. Alpacas are susceptible, particularly when they have an existing wound, skin irritation, or fleece contaminated with a heavy amount of feces or urine.
Warm temperatures and damp conditions create particularly favorable circumstances for fly activity. However, flystrike is not limited to a particular month or a fixed fly season. Owners should remain alert whenever flies are active.
What Causes Flystrike in Alpacas?
Flies are attracted to several conditions that can occur around an alpaca's body. Some of the most common risk factors include:
Wounds and damaged skin
Even relatively small cuts, scratches, abrasions, or areas of irritated skin can attract flies. Wounds should be cleaned appropriately, monitored, and treated promptly rather than left to heal unnoticed beneath the fleece.
Diarrhea and soiled fleece
Diarrhea can leave the fleece around an alpaca's rear end contaminated with feces. This creates an area that may attract flies, particularly during warm weather. Animals experiencing diarrhea should be monitored closely, and the surrounding fleece should be checked and kept as clean as practical.
Wet or damp areas
Persistent moisture, particularly when combined with soiling or damaged skin, can increase the risk of fly problems. A suspicious wet patch in the fleece deserves investigation. It may be rainwater, but it could also be discharge from an underlying wound or developing skin problem.
Skin infections and irritation
Areas of inflamed, infected or damaged skin can attract flies. Any unexplained scabs, sores, swelling or weeping skin should be investigated rather than ignored.
Warm and humid weather
Fly activity generally increases as temperatures rise. Warm weather following periods of rain can be particularly problematic, especially when animals have wounds or soiled fleece.
Warning Signs of Flystrike: What to Look For
Early detection is extremely important. Flystrike may initially be hidden beneath the fleece, so simply looking at the outside of an alpaca is not always enough.
There are several things owners should watch for.
1. Wet or discolored patches in the fleece
One of the most important warning signs is an unusual wet, damp, or discolored patch.
The fleece may appear darker, matted, or stained. Sometimes there may be a noticeable discharge or unpleasant smell.
Do not automatically assume a wet patch is simply rainwater or something the animal has rolled in. Catch the alpaca, part the fleece, and examine the skin underneath.
2. Unusual behavior
Changes in behavior can be an early indication that something is wrong.
An affected alpaca may:
Appear restless or uncomfortable.
Spend more time lying down than usual.
Repeatedly get up and lie back down.
Separate itself from the rest of the herd.
Appear depressed, dull, or less responsive.
Lose interest in food.
These can all be signs of a myriad of health issues, so keeping an eye on your herd throughout your routine care is essential. Getting to know the normal behavior of individual animals makes these changes easier to recognize.
3. Increased attention from flies
If flies seem particularly attracted to one alpaca or repeatedly gather around a particular area, investigate further.
There may be an underlying wound, irritated skin, or soiled fleece attracting them.
4. Wounds, sores and damaged skin
Pay particular attention to cuts, scratches, abrasions and areas where the skin appears inflamed or is weeping.
Even a relatively minor wound can become a problem if flies have access to it.
5. Diarrhea and soiling around the rear
Diarrhea is worth taking seriously for several reasons, including the increased risk of attracting flies.
Check the fleece around the tail and rear end regularly. Any persistent diarrhea also warrants veterinary attention, as it can indicate an underlying health problem and can become particularly dangerous.
6. An unpleasant smell
An unusual or foul smell coming from beneath the fleece should never be ignored. Decomposing tissue and infected wounds can produce a distinctive unpleasant odor.
If you notice this, investigate immediately.
How to Check Your Alpacas for Flystrike
Regular hands-on inspections are one of the most valuable preventative measures an alpaca owner can take.
During periods of increased fly activity, check your animals frequently. After warm, wet weather, or when an animal has diarrhea or an existing wound, more frequent inspections may be appropriate.
When checking an alpaca:
Look for unusual wet or discolored patches in the fleece.
Part the fleece in suspicious areas and examine the skin directly.
Check around the tail and rear end for fecal contamination.
Look for wounds, scratches, scabs, swelling, or weeping skin.
Pay attention to areas that seem to be attracting an unusual number of flies.
Observe the animal's general behavior, appetite, and activity.
Remember that a healthy-looking fleece does not necessarily mean the skin underneath is healthy. Taking the time to part the fleece and actually see the skin is important.
If you find something suspicious, investigate and treat as needed, or seek advice and veterinary assistance if you are unsure how to proceed.
If you're developing a regular herd health routine, take a look at our guide to Alpaca Health Checks: 5 Things to Monitor Regularly. It covers several important things to monitor, including behavior, body condition, eyelid color, stool and weight.
How to Prevent Flystrike in Alpacas
There is no single solution that guarantees an alpaca will never develop flystrike. The best approach is to reduce the conditions that attract flies and make regular inspections part of your normal herd management routine.
Keep Pastures and Living Areas Clean
Good pasture hygiene helps reduce fly populations around your animals.
Regularly remove manure from paddocks, particularly around communal poo piles, feeding areas, and shelters. Keep feeding areas clean and avoid allowing wet, heavily soiled areas to develop where alpacas spend much of their time.
Remove any dead animals and decaying organic material in the area promptly and dispose of them appropriately.
Manage Diarrhea Promptly
Keep an eye on stool consistency and investigate animals that develop diarrhea.
If an alpaca has a soiled rear end, clean the affected area appropriately and prevent feces from accumulating in the fleece. Depending on the individual animal, carefully trimming contaminated fleece may be helpful.
Any trimming should be done carefully to avoid cutting the skin. Persistent diarrhea should be investigated by a veterinarian or specialist.
Treat Wounds and Skin Problems
Do not overlook small cuts, scratches, or areas of damaged skin.
Clean minor wounds appropriately and monitor them to ensure they are healing. If a wound becomes swollen, painful, infected, or begins to discharge, seek veterinary advice.
During fly season, pay particular attention to any animal recovering from an injury or skin condition.
Maintain Good Fleece Management
Regular shearing is helpful for more than just harvesting the fiber. Removing excess fleece makes it easier to inspect the skin, identify injuries, and spot developing problems before they become more serious.
However, shearing does not eliminate the risk of flystrike. Recently shorn animals still need regular inspections, and any cuts or skin injuries should be addressed and monitored.
Learn more about the importance of regular shearing in our guide to Everything You Need to Know About Alpaca Shearing
Use Fly Control Measures Sensibly
Fly traps and other environmental fly-control measures can help reduce nuisance fly populations around barns, shelters and feeding areas.
Good ventilation and reducing damp conditions around shelters can also help.
There are various topical fly repellents and insect-control products available, but owners should be careful about what they apply directly to alpacas. A product approved for cattle or sheep is not automatically appropriate for camelids.
Always discuss suitable products with a veterinarian familiar with camelids. Follow the product label and veterinary instructions, particularly where products are being used off-label.
Pay Extra Attention to Vulnerable Animals
Young crias, elderly animals, sick alpacas, and those recovering from injuries or other health problems may need additional attention.
An animal that is less active or unable to keep itself clean is more likely to have problems go unnoticed. Check these animals particularly carefully during periods of high fly activity.
Cornell University also provides a useful flystrike and myiasis fact sheet covering flystrike prevention and management in sheep and other livestock.
What Should You Do If You Suspect Flystrike?
Flystrike is a veterinary emergency. Do not adopt a wait-and-see approach.
If you find maggots or strongly suspect flystrike, contact your veterinarian immediately. Flystrike can progress rapidly, and delaying treatment can result in significant tissue damage, infection, and serious illness.
Treatment generally involves several steps:
1. Remove the affected fleece
The fleece around the affected area needs to be removed so the skin and full extent of the infestation can be examined. It is important not to overlook maggots that may be hidden beneath surrounding fleece.
2. Remove the maggots
All maggots need to be located and removed. Depending on the severity and location of the infestation, some may be difficult to reach or embedded beneath the skin. Your veterinarian can determine the safest and most effective way to remove them.
3. Clean and treat the affected area
Once the maggots have been removed, the wound needs to be thoroughly cleaned and assessed. Damaged or dead tissue may require additional treatment. Your veterinarian may recommend appropriate wound-care products, insect-control treatments, or other medications to help eliminate any remaining larvae and prevent further problems.
4. Treat the animal and monitor recovery
Depending on the severity of the infestation, additional veterinary treatment may include pain relief, anti-inflammatory medication, antibiotics if a secondary bacterial infection is present, and other supportive care. The affected area should be monitored closely as it heals because damaged skin can remain attractive to flies.
Do not assume that simply applying fly spray or a wound cream will resolve the problem. An established infestation needs proper assessment and treatment.
If an animal is dull, lethargic, reluctant to stand, or not eating, it may already be experiencing more serious effects and needs urgent veterinary support.
Even after treatment, continue checking the affected area and follow your veterinarian's instructions until it has completely healed.
Can Hydrogen Peroxide Help Remove Maggots?
Hydrogen peroxide is sometimes used as an aid in removing maggots from flystrike. Its bubbling and foaming action may encourage maggots to move out of the affected area, making them easier to locate and remove. In our experience, it can be helpful in certain situations.
However, it should be used with caution. Hydrogen peroxide can damage healthy tissue and may interfere with wound healing. It also should not be relied upon to kill or remove every maggot.
If you discover maggots on an alpaca, contact your veterinarian as soon as possible. Ask for their guidance before applying hydrogen peroxide or attempting treatment. The affected area needs to be fully exposed, all maggots removed, and the wound properly cleaned and treated. Flystrike can progress quickly, so veterinary attention should not be delayed.
The bottom line: Hydrogen peroxide may be a useful aid in certain circumstances, but it is not a substitute for thorough maggot removal and proper veterinary treatment. When in doubt, consult your veterinarian first.
Final Thoughts: Don't Let Your Guard Down
Flystrike is not something alpaca owners should only think about when flies first appear in spring. Warm temperatures, wet weather, and ongoing fly activity can create risks well beyond what many owners consider the traditional fly season.
The most important thing you can do is get to know your animals and make regular health checks part of your routine.
Pay attention to changes in behavior, investigate unusual wet patches, keep wounds clean, and address diarrhea promptly. Most importantly, take the time to part the fleece and check the skin underneath.
A few extra minutes spent checking your herd can make a significant difference. When it comes to flystrike, early detection and prompt veterinary treatment are essential.
