If your dog suddenly starts losing patches of fur, develops crusty skin, or can’t seem to stop scratching, mange may be the cause. While the word “mange” often sounds frightening, it simply refers to a skin disease caused by microscopic mites. Some forms of mange are mildly irritating, while others can cause intense itching and widespread skin infections if left untreated.

The good news is that most cases of mange in dogs are highly treatable, especially when diagnosed early. Understanding which type of mange your dog has is important because treatment, contagiousness, and long-term management differ between the two main forms.

One of the reasons I started this website is because I know what it’s like to leave the veterinary clinic with more questions than answers. Even with animal science degrees and a career in veterinary medicine, I’ve found myself going home after appointments and spending hours reading veterinary journals, talking with specialists, and trying to learn everything I could to help my own pets.

Over the years, I’ve cared for dogs with complex medical conditions, and I understand how overwhelming it can feel when you’re trying to make the best decisions for a pet you love. That’s why I write these guides—to combine my education, experience, and personal research into one place that’s easy for pet owners to understand.

This article isn’t a substitute for your veterinarian’s advice, but my goal is to help you better understand the condition, know what questions to ask, and learn about the treatments, diets, supplements, and products that may help improve your dog’s quality of life.

In this guide, you’ll learn everything you need to know about mange in dogs, including the differences between demodectic mange and sarcoptic mange, symptoms, causes, diagnosis, treatment options, supplements that may support skin health, and how to prevent future outbreaks.

What Is Mange?

Mange is a skin disease caused by microscopic mites that live on or within a dog’s skin.

The two most common forms are:

• Demodectic mange (Demodex mites)
• Sarcoptic mange (Sarcoptes scabiei mites)

Although both conditions affect the skin, they behave very differently.

Demodectic Mange vs. Sarcoptic Mange

Understanding the differences can help you recognize symptoms and understand your veterinarian’s treatment recommendations.

Because the two conditions look similar, veterinary testing is necessary to determine which type of mange is present.

What Is Demodectic Mange?

Demodectic mange, sometimes called red mange, is caused by Demodex mites, which normally live in small numbers within the hair follicles of healthy dogs.

Most dogs carry these mites throughout their lives without any problems.

Disease develops when the immune system cannot keep the mite population under control.

This commonly occurs in:

• Puppies
• Young dogs
• Dogs with weakened immune systems
• Dogs with certain underlying illnesses

Demodectic mange is generally not considered contagious to healthy adult dogs.

What Is Sarcoptic Mange?

Sarcoptic mange, also known as canine scabies, is caused by Sarcoptes scabiei mites.

Unlike Demodex mites, these mites burrow into the skin and cause an intense allergic reaction.

Sarcoptic mange is:

• Extremely itchy
• Highly contagious to other dogs
• Able to spread through direct contact
• Occasionally capable of causing temporary itching in people

Because of its contagious nature, prompt treatment is important.

Symptoms of Demodectic Mange

Signs often develop gradually.

Common symptoms include:

• Patchy hair loss
• Thin hair coat
• Red skin
• Mild itching
• Scaly skin
• Crusting
• Blackheads
• Secondary skin infections
• Thickened skin in severe cases

Localized demodectic mange often affects the face and front legs.

Symptoms of Sarcoptic Mange

Sarcoptic mange usually causes much more severe itching.

Common symptoms include:

• Intense scratching
• Constant chewing
• Hair loss
• Thick crusts
• Red skin
• Scabs
• Ear edge crusting
• Elbow lesions
• Belly lesions
• Restlessness
• Poor sleep due to itching
• Secondary skin infections

Some dogs scratch so intensely that they create wounds from self-trauma.

What Causes Mange?

The causes differ depending on the type.

Demodectic Mange

Demodectic mange usually develops because the immune system cannot properly regulate naturally occurring mites.

Factors that increase risk include:

• Young age
• Genetic predisposition
• Chronic illness
• Immune suppression
• Poor overall health

Sarcoptic Mange

Sarcoptic mange develops after exposure to infected animals.

Dogs may become infected through:

• Direct contact with infected dogs
• Wildlife such as foxes or coyotes
• Contaminated bedding or grooming equipment (less commonly)

Which Dogs Are Most at Risk?

Demodectic Mange

Higher-risk dogs include:

• Puppies
• Young adult dogs
• Bulldogs
• Shar-Peis
• Staffordshire Bull Terriers
• Pit Bull-type breeds
• Dogs with weakened immune systems

Sarcoptic Mange

Any dog can develop sarcoptic mange, especially if they have contact with infected animals.

Dogs in shelters, boarding facilities, breeding kennels, or multi-dog households may have increased exposure risk.

Is Mange Contagious?

This depends on the type.

Demodectic Mange

No.

Demodectic mange is generally not contagious to healthy dogs or people.

Sarcoptic Mange

Yes.

Sarcoptic mange spreads easily between dogs.

People may also develop temporary itchy skin lesions after close contact with an infected dog, although the mites typically cannot complete their life cycle on humans.

How Is Mange Diagnosed?

Veterinarians usually diagnose mange through a combination of examination and testing.

Diagnostic tests may include:

• Skin scraping
• Hair pluck examination
• Skin cytology
• Tape preparations
• Skin biopsy in difficult cases
• Response to treatment

Because Sarcoptes mites can be difficult to find on skin scrapings, veterinarians sometimes diagnose sarcoptic mange based on symptoms and response to treatment.

Treatment for Mange

Fortunately, modern treatments are highly effective.

Your veterinarian may recommend:

• Prescription parasite preventives
• Oral medications
• Topical medications
• Medicated shampoos
• Antibiotics for secondary infections
• Anti-itch medications
• Anti-inflammatory medications

Treatment length varies depending on the severity of infection and the type of mange.

How Long Does It Take for Mange to Heal?

Most dogs begin improving within several weeks after treatment starts.

Complete recovery often takes:

• One to three months for localized demodectic mange
• Two to three months or longer for generalized demodectic mange
• Four to eight weeks for sarcoptic mange, although itching often improves much sooner

Hair regrowth may continue for several months after the mites are eliminated.

The Best Diet for Dogs Recovering From Mange

A nutritious, balanced diet supports healthy skin and immune function during recovery.

Many veterinarians recommend diets containing:

• High-quality protein
• Omega-3 fatty acids
• Balanced vitamins and minerals
• Easily digestible ingredients

Dogs with generalized demodectic mange may also benefit from evaluating and addressing any underlying illnesses affecting immune function.

Top Picks: High-quality dog foods, and sensitive skin diets

Supplements That May Support Skin Health

Supplements cannot eliminate mange mites, but they may support healthy skin and coat recovery alongside veterinary treatment.

Omega-3 Fish Oil

Omega-3 fatty acids are commonly recommended to support skin health.

Potential benefits include:

• Supporting a healthy inflammatory response
• Improving skin barrier function
• Promoting coat regrowth
• Reducing dry skin
• Supporting heart, brain, and joint health

While fish oil won’t kill mites, it may help support healthier skin during recovery.

Great Option: High-quality canine fish oil supplements.

Probiotics

A healthy digestive system supports normal immune function.

Probiotics may help:

• Support healthy digestion
• Maintain beneficial gut bacteria
• Support immune health
• Promote overall wellness

Dogs recovering from skin infections or receiving antibiotics may also benefit from probiotic supplementation.

Great Choices: Veterinary-formulated probiotic powders and soft chews.

Skin and Coat Supplements

Products containing omega fatty acids, biotin, vitamin E, or other skin-support nutrients may help maintain healthy skin and encourage coat regrowth after treatment.

These supplements work best when combined with effective mite treatment.

Great Pick: Skin and coat supplements for dogs.

Preventing Mange

Preventive measures depend on the type of mange.

Helpful strategies include:

• Keep your dog on year-round parasite prevention.
• Avoid contact with dogs known to have sarcoptic mange.
• Schedule routine veterinary examinations.
• Address underlying medical conditions promptly.
• Maintain good nutrition.
• Groom regularly to monitor skin health.

Many modern flea and tick preventives also provide protection against mange mites. Talk with your veterinarian about which product is most appropriate for your dog.

Products That Can Help During Recovery

Many owners find these products useful:

• Flea and tick preventives that also protect against mites
• Fish oil supplements
• Veterinary probiotics
• Skin and coat supplements
• Medicated shampoos

When Should You Contact Your Veterinarian?

Schedule a veterinary appointment if your dog develops:

• Hair loss
• Persistent itching
• Thick crusts or scabs
• Red, inflamed skin
• Recurrent skin infections
• Excessive licking or chewing
• Widespread skin lesions
• Hair loss that continues to worsen

Early treatment helps reduce discomfort, prevents secondary infections, and minimizes the spread of contagious sarcoptic mange.

Final Thoughts

Mange can be an uncomfortable condition, but it’s also one of the most treatable skin diseases in dogs. Whether your dog has demodectic mange, which is usually related to immune function, or sarcoptic mange, which is highly contagious and intensely itchy, prompt veterinary care can lead to an excellent outcome.

Modern medications have made treatment safer and more effective than ever before. By combining appropriate parasite control, good nutrition, skin-supportive care, and regular veterinary follow-up, most dogs recover fully and return to living happy, healthy lives.

If you notice patchy hair loss, persistent scratching, or crusty skin lesions, don’t wait for the problem to spread. An early diagnosis often means faster healing and a more comfortable recovery for your dog.

Frequently Asked Questions

What is the difference between demodectic and sarcoptic mange?

Demodectic mange is caused by naturally occurring Demodex mites and is usually not contagious. Sarcoptic mange is caused by Sarcoptes mites, causes intense itching, and spreads easily between dogs.

Is mange contagious to other dogs?

Demodectic mange is generally not contagious to healthy dogs. Sarcoptic mange is highly contagious and requires prompt treatment to prevent spreading.

Can humans catch mange from dogs?

People can develop temporary itchy skin lesions after exposure to dogs with sarcoptic mange, but the mites usually cannot survive long-term on humans. Demodectic mange is not considered contagious to people.

What does mange look like on a dog?

Mange often causes hair loss, red skin, scabs, crusting, scaling, and itching. Sarcoptic mange usually causes much more severe itching than demodectic mange.

How long does it take to cure mange?

Many dogs improve within a few weeks, but complete recovery may take one to three months or longer depending on the type of mange and the severity of the infection.

Can mange go away on its own?

Localized demodectic mange in some puppies may resolve without treatment, but most cases should still be evaluated by a veterinarian. Sarcoptic mange requires treatment and will not typically resolve on its own.

What is the best treatment for mange?

Treatment usually involves prescription medications that kill mites, along with treatment for any secondary skin infections and supportive skin care.

Can flea and tick preventives prevent mange?

Many modern prescription flea and tick preventives also protect against certain mange mites. Ask your veterinarian which product is best for your dog.

Are omega-3 supplements good for dogs with mange?

Omega-3 fatty acids may help support skin health, coat regrowth, and a healthy inflammatory response during recovery, but they do not kill mites.

When should I take my dog to the veterinarian?

See your veterinarian if your dog develops persistent itching, patchy hair loss, crusty skin, sores, or skin infections, or if you suspect your dog has been exposed to another dog with sarcoptic mange.

Snout and About Team

The Snout and About team includes pet owners and animal health professionals with backgrounds in animal science and veterinary medicine and firsthand experience managing serious pet health conditions. Our goal is to make veterinary information accessible and actionable for everyday pet owners.