Mange in Horses: Signs, Treatment and Prevention

By Dr Duncan Houston

Mange in horses is not as common as in some other animals, but when it happens, it can make a horse intensely itchy, uncomfortable, restless, and difficult to manage.

The problem is caused by mites. These tiny parasites irritate the skin, trigger inflammation, and can lead to hair loss, crusting, thickened skin, rubbing, stamping, biting, and secondary infection. Mange is rare in horses, but it should not be ignored because the discomfort can be severe and the condition can spread between animals in some cases. (MSD Veterinary Manual)

The most important point is this: not every itchy, scabby horse has mange. Pastern dermatitis, lice, fungal infection, allergies, mud fever, chronic progressive lymphedema, and bacterial skin disease can look very similar. A correct diagnosis matters because the wrong treatment can waste time, irritate the skin, and allow the real problem to worsen.

Quick Answer

Mange in horses is a mite-related skin disease that causes itching, hair loss, crusting, scaling, and skin irritation. The most common form is chorioptic mange, often called leg mange, which usually affects the lower legs and is especially common in heavily feathered breeds. Treatment usually involves veterinary diagnosis, clipping affected hair if needed, mite treatment, management of secondary infection, cleaning equipment and the environment, and treating in-contact horses when appropriate. (MSD Veterinary Manual)

What Is Mange in Horses?

Mange is a group of skin diseases caused by mites.

The mites either burrow into the skin, live on the surface, or irritate hair follicles and skin structures. The horse then reacts to the mites and their products, often with intense itching and inflammation.

Common signs include:

• Itching

• Rubbing on fences, gates, walls, or stable doors

• Foot stamping

• Biting at the legs

• Hair loss

• Scaling or dandruff-like flakes

• Crusting

• Thickened skin

• Raw or moist patches

• Secondary bacterial infection

• Restlessness or reduced comfort

In practice, the biggest clue is not just the presence of scabs. It is the pattern: where the lesions are, how itchy the horse is, whether other horses are affected, and whether the signs recur in certain seasons.

The Main Types of Mange in Horses

There are several mite problems that can affect horses, but three are especially important to understand.

Chorioptic Mange: Leg Mange

Chorioptic mange is the most common form of mange in horses. It is caused by Chorioptes mites and usually affects the lower limbs, especially around the foot, pastern, and fetlock. Draft horses and heavily feathered breeds are commonly affected, although any horse can develop it. (MSD Veterinary Manual)

Typical signs include:

• Itching around the lower legs

• Foot stamping

• Biting at the pasterns or fetlocks

• Rubbing one leg against the other

• Flaky skin under the feathers

• Crusts around the pastern or fetlock

• Thickened skin in chronic cases

• Moist dermatitis if the skin becomes infected

This is why chorioptic mange is often confused with mud fever, scratches, greasy heel, or pastern dermatitis. The horse may look like it has a bacterial skin problem, but mites may be driving the irritation underneath.

A very common pattern is improvement in warmer months and recurrence when cold, damp weather returns. MSD Veterinary Manual notes that chorioptic mange often becomes chronic without treatment but has a favourable prognosis when treated properly. (MSD Veterinary Manual)

Sarcoptic Mange: Scabies

Sarcoptic mange is rare in horses, but it is the most severe type. It causes intense itching and can spread across the body if not treated. Early lesions often appear on the head, neck, and shoulders, then progress to crusting, hair loss, thickened skin, weight loss, weakness, and appetite loss in severe untreated cases. (MSD Veterinary Manual)

This is the type that should raise the greatest concern because it can be highly contagious and very uncomfortable.

A horse with severe itching, spreading crusts, weight loss, or multiple affected areas needs prompt veterinary attention.

Psoroptic Mange: Mane, Tail and Ear Regions

Psoroptic mange is uncommon in horses. When it occurs, lesions tend to affect thicker-haired areas such as the mane, base of the tail, under the chin, between the hind legs, under the forelimbs, or sometimes the ears. Ear involvement may cause head shaking. (MSD Veterinary Manual)

Signs may include:

• Itching

• Crusts

• Hair loss

• Thickened or bleeding crusted lesions

• Head shaking if the ears are involved

This is another reason diagnosis matters. A horse rubbing its mane and tail may have mites, but other causes such as lice, sweet itch, pinworm irritation, allergy, or fungal disease may be involved too.

Severity Guide: How Worried Should You Be?

The key clinical checkpoint is whether this is a local skin irritation or a horse becoming genuinely unwell. Mange can start as an itch, but secondary infection and severe self-trauma can turn it into a much bigger welfare issue.

What Else Can Look Like Mange?

This is where many owners go wrong. They see itching and scabs, then jump straight to mite treatment.

The main differentials include:

Pastern dermatitis
This is a broad term, not one single disease. It can involve bacteria, moisture, trauma, mites, immune-mediated disease, photosensitivity, or chronic progressive lymphedema.

Mud fever or scratches
This often affects the lower legs and can look very similar to chorioptic mange. In some horses, mites and bacterial infection occur together.

Lice
Lice can cause rubbing, hair loss, dandruff, and irritation, especially in winter coats or horses in poor condition.

Sweet itch
This is an allergic reaction to insect bites and usually affects the mane, tail, belly, and midline more than the lower legs.

Ringworm
Fungal infection can cause circular patches of hair loss and scaling. It is contagious and requires a different approach.

Allergic skin disease
Feed, bedding, insect bites, topical products, or environmental triggers can cause itching and skin inflammation.

Chronic progressive lymphedema
This is especially important in some heavy breeds. It can cause thickened lower-leg skin, swelling, recurrent infections, and secondary parasite problems. UC Davis notes that there is no permanent cure for chronic progressive lymphedema, but management focuses on supportive care, secondary infection control, antiparasitic treatment to avoid Chorioptes reinfestation, feather clipping, daily exercise, hoof care, and dry environmental management. (Horse Report)

The real concern is not simply whether mites are present. It is whether mites are the primary cause, a secondary complication, or only one part of a bigger lower-leg disease.

How Vets Diagnose Mange in Horses

A vet will usually start with the pattern of signs.

Important questions include:

• Where are the lesions?

• Is the horse itchy?

• Is the horse stamping or biting at the legs?

• Are other horses affected?

• Has this happened before?

• Is it seasonal?

• Are the legs heavily feathered?

• Is there swelling, heat, pain, or discharge?

• Has anything already been applied to the skin?

• Are grooming tools, rugs, tack, or stabling shared?

Diagnostic tests may include:

• Skin scrapings

• Coat brushings

• Tape preparations

• Hair plucks

• Microscopic examination

• Skin cytology for bacteria or yeast

• Fungal testing if ringworm is possible

• Biopsy in chronic, unusual, or non-responsive cases

A negative skin scraping does not always rule out mange. MSD Veterinary Manual notes that sarcoptic mites may be difficult to find, and biopsy may be needed when signs strongly suggest disease despite negative scrapings. (MSD Veterinary Manual)

That is why veterinary judgement matters. The test result is important, but the clinical pattern matters too.

When Is Mange an Emergency?

Mange itself is not always an emergency, but some situations need urgent veterinary care.

Seek prompt help if your horse has:

• Severe or constant itching

• Bleeding or raw skin

• Rapidly spreading lesions

• Painful swelling of the lower legs

• Heat, pus, discharge, or foul smell from the skin

• Fever

• Reduced appetite

• Weight loss

• Weakness

• Depression or lethargy

• Multiple horses affected

• Severe lesions on the head, neck, shoulders, or across the body

• Skin disease that is worsening despite treatment

Do not wait if the horse is systemically unwell. Once a skin problem is complicated by infection, pain, swelling, or loss of condition, it needs more than a parasite product.

What Should You Do First?

If you suspect mange, take a controlled approach.

1. Reduce spread while you wait for diagnosis

Use separate grooming tools, rugs, boots, and tack for the affected horse. Avoid sharing brushes or leg wraps between horses.

If several horses are in close contact, tell your vet. In-contact animals may need assessment or treatment even if they look normal.

2. Do not scrub the skin aggressively

Itchy, crusted skin is already inflamed. Harsh scrubbing can worsen pain and damage the skin barrier.

Gentle cleaning may help, but aggressive picking, scraping, or repeated washing can make the horse more uncomfortable.

3. Do not apply random insecticides

This is a big one.

Do not use dog, cattle, sheep, or household parasite products on a horse unless your vet specifically advises it. Some products are not suitable for horses, some are too irritating for damaged skin, and some may be unsafe if used incorrectly.

4. Take photos

Photograph the affected areas before treatment. Take clear images of the whole horse and close-ups of the lesions.

This helps track whether the problem is improving or spreading.

5. Call your vet

A proper diagnosis is the fastest route to the right plan. It also prevents weeks of treating the wrong condition.

How Mange in Horses Is Treated

Treatment depends on the mite type, severity, skin condition, and whether there are secondary infections.

A good treatment plan usually includes several parts.

Clipping and Skin Access

For horses with heavy feathers or thick hair, clipping may be recommended so treatment can reach the skin.

This is especially helpful with chorioptic mange. Long feathering can trap moisture, debris, skin flakes, and mites, making treatment harder.

Not every horse needs full clipping, but if mites are living deep under dense feathers, surface sprays may not reach the problem properly.

Mite Treatment

Veterinary treatment may involve topical or systemic mite control.

MSD Veterinary Manual states that hot lime sulfur spray or dip is labelled for sarcoptic, psoroptic, and chorioptic mites in horses, with repeat treatment as needed according to label instructions. It also notes that certain permethrin formulations are labelled for mange in horses, although permethrin is not generally considered the compound of choice. (MSD Veterinary Manual)

Oral macrocyclic lactones such as ivermectin or moxidectin may also be used by vets in some cases, although MSD notes that oral ivermectin and moxidectin are not labelled specifically for mange treatment in horses despite evidence of effectiveness in field studies. (MSD Veterinary Manual)

This is exactly why owners should not self-prescribe. The right product, dose, timing, and repeat schedule should be decided by a vet, especially if the horse is young, debilitated, pregnant, heavily infested, systemically unwell, or on other medication.

Treating Secondary Infection

Mange damages the skin barrier. Once the horse rubs, bites, stamps, and breaks the skin, bacteria can move in.

Secondary infection may require:

• Antibacterial washes

• Topical medication

• Oral antibiotics in more severe cases

• Anti-inflammatory medication

• Pain relief

• Supportive skin care

If the skin is hot, swollen, painful, wet, smelly, or discharging, mite treatment alone is unlikely to be enough.

Treating In-Contact Horses

Some mange mites spread through close contact or shared equipment.

If one horse is diagnosed, your vet may recommend checking or treating horses that share:

• Stables

• Paddocks

• Rugs

• Grooming tools

• Transport

• Tack

• Leg wraps

• Wash bays

This is especially important in yards, studs, rescue centres, riding schools, and multi-horse properties.

Environmental Control

Mite control is not only about the horse.

Depending on the case, your vet may recommend:

• Washing rugs and saddle pads

• Disinfecting grooming tools

• Cleaning stable surfaces

• Removing heavily contaminated bedding

• Avoiding shared brushes and boots

• Keeping lower legs clean and dry

• Reducing mud exposure where possible

• Managing feathers in high-risk horses

Environmental control is one of the reasons recurrence happens. The horse improves, but the same contaminated tools, rugs, or untreated companions reintroduce the problem.

Common Mistakes Owners Make

Treating Before Diagnosing

The most common mistake is assuming every itchy, scabby horse has mange.

If the real problem is ringworm, bacterial pastern dermatitis, sweet itch, allergy, lice, or chronic progressive lymphedema, the wrong treatment delays recovery.

Using the Wrong Product

A product that is safe for one species may not be safe or appropriate for another. Horse skin, damaged skin, body size, coat type, and drug handling all matter.

Never use canine mange products, farm insecticides, or home remedies without veterinary direction.

Only Treating One Horse

If mites are spreading between horses, treating only the worst-looking horse may not solve the outbreak.

In-contact horses can act as reservoirs.

Ignoring Secondary Infection

If the skin is swollen, painful, raw, wet, or infected, mite treatment alone may fail.

The mites may be the trigger, but infection can become the main reason the horse remains sore.

Stopping Too Early

Itching may improve before the mite problem is fully controlled. Stopping treatment early can allow recurrence.

Follow your vet’s repeat-treatment schedule and recheck plan.

Leaving Feathers Unmanaged in Recurrent Cases

In heavily feathered horses, dense hair can make mite control difficult. Clipping may feel drastic, but in recurrent leg mange it can be the difference between repeated flare-ups and real control.

How To Prevent Mange in Horses

Prevention is about reducing exposure, improving skin health, and catching early signs before they spread.

Useful prevention steps include:

• Keep grooming tools separate between horses

• Clean and disinfect shared equipment regularly

• Wash rugs, saddle pads, and leg wraps when contamination is possible

• Monitor feathered legs closely, especially in winter

• Keep lower legs as dry and clean as practical

• Clip feathers in horses with recurrent chorioptic mange if advised by your vet

• Check new arrivals before introducing them to the herd

• Quarantine horses with suspicious skin disease

• Treat all affected and exposed horses when your vet recommends it

• Manage mud exposure where possible

• Address pastern dermatitis early

• Keep horses in good general health

• Monitor older, immune-compromised, or chronically affected horses more closely

For heavy breeds with recurrent lower-leg problems, prevention may need to become part of the routine rather than a one-off fix.

Will a Horse Recover From Mange?

Yes, many horses recover well when mange is diagnosed and treated properly.

The outcome depends on:

• The mite type

• How severe the skin damage is

• Whether secondary infection is present

• Whether other horses are also affected

• Whether the environment is managed

• Whether there is an underlying condition such as chronic progressive lymphedema

• Whether treatment reaches the skin properly

Chorioptic mange can be persistent, especially in heavily feathered horses, but it is usually manageable with the right plan. Sarcoptic mange is more serious and should be treated promptly.

The earlier the condition is identified, the easier it usually is to control.

FAQs

Can humans catch mange from horses?

Some mite problems can cause temporary irritation in people, especially with close contact, but the risk depends on the mite involved. If people handling the horse develop an itchy rash, they should contact a medical professional and tell them there has been exposure to a horse with suspected mange.

Is mange in horses contagious?

Some forms can spread through close contact or contaminated equipment. If one horse is diagnosed, in-contact horses and shared equipment should be assessed as part of the control plan.

What does leg mange look like in horses?

Leg mange often causes itching, foot stamping, biting at the lower legs, flaky skin, crusting, hair loss, and thickened skin around the pasterns and fetlocks. It is especially common in horses with heavy feathering.

Can I treat horse mange with ivermectin paste?

Do not self-treat without veterinary guidance. Ivermectin and other macrocyclic lactones may be used in some cases, but treatment choice, dosing, repeat timing, and safety depend on the horse and the diagnosis. MSD notes that oral ivermectin use for mange in horses is not specifically labelled even though it has been effective in field studies. (MSD Veterinary Manual)

Why does my horse’s mange keep coming back?

Common reasons include untreated in-contact horses, contaminated grooming equipment, dense feathering that prevents treatment reaching the skin, stopping treatment too early, secondary infection, or an underlying lower-leg condition such as chronic progressive lymphedema.

Final Thoughts

Mange in horses is not just a cosmetic skin problem. It can cause real discomfort, repeated self-trauma, secondary infection, and yard-level spread if the cause is missed.

The most practical approach is to confirm the diagnosis, treat the mites properly, manage infection if present, clean the environment, and assess in-contact horses. For heavily feathered breeds, especially those with recurring lower-leg irritation, prevention and monitoring are just as important as treatment.

The main thing is not to guess. An itchy, scabby horse needs a plan, not a random product from the tack room.

If you are unsure whether your horse has mange, mites, mud fever, pastern dermatitis, lice, or another skin condition, ASK A VET™ can help you work through the signs and decide how urgently your horse needs veterinary care.