Mange is a skin disease in dogs caused by microscopic mites that live on or inside the skin. It leads to intense itching, hair loss, and crusty or inflamed skin. There are two main types, each caused by a different mite, and they behave very differently in terms of severity, spread, and treatment.
The Two Main Types of Mange
Demodectic mange (sometimes called “red mange”) is caused by a cigar-shaped mite that lives inside hair follicles. Nearly all dogs carry small numbers of these mites, picked up from their mother during nursing in the first days of life. In a healthy dog, the immune system keeps the population in check, and the mites cause no problems at all. Mange develops only when something allows the mites to multiply out of control.
Sarcoptic mange (also called “scabies”) is caused by a different mite that burrows deep into the outer layer of skin. Unlike demodectic mites, these aren’t a normal part of your dog’s skin. They spread mainly through direct contact with an infected animal, though indirect transmission through shared bedding, brushes, or other objects is also possible. Sarcoptic mange is far more contagious and causes more immediate, severe itching.
How Sarcoptic Mange Looks and Feels
The hallmark of sarcoptic mange is relentless scratching. Dogs with scabies are intensely itchy, often to the point of injuring themselves from constant scratching and chewing. The mites tend to target areas with thinner hair or less fur: the ears, elbows, hocks (ankles), chest, abdomen, and face. Early on, you’ll notice small red bumps similar to insect bites. As the disease progresses, the skin develops scaling, oozing, crusting, and thick scabs. Hair falls out in affected areas, and dogs with advanced cases often lose significant weight.
One useful clue veterinarians look for is the ear-scratch reflex. When you gently rub the edge of your dog’s ear flap between your fingers, a dog with sarcoptic mange will almost involuntarily kick a hind leg. It’s not a definitive test on its own, but it’s a strong indicator.
Demodectic Mange: Localized vs. Generalized
Demodectic mange comes in two forms, and the distinction matters because they carry very different outlooks.
Localized demodicosis means your dog has no more than four spots of hair loss, affecting no more than two body regions. A patch or two on the face and another on a front leg would still count as localized. This form is common in puppies and adolescent dogs, and roughly 90% of localized cases resolve on their own as the dog’s immune system matures.
Generalized demodicosis is more serious. Large patches of skin are affected, sometimes giving the dog a polka-dot appearance of bald, inflamed spots. If left untreated, the condition can eventually cover the dog’s entire body. Once a dog has more than four spots, or the affected areas are widespread, it’s classified as generalized, and treatment becomes necessary. Secondary bacterial infections are common in generalized cases because the damaged skin barrier lets bacteria in, leading to pustules, swelling, and a distinctive musty odor.
What Triggers Mange to Develop
Sarcoptic mange is straightforward: your dog catches the mites from another animal or a contaminated environment. Any dog can get it regardless of age or health status.
Demodectic mange is more complicated. In puppies and young dogs, it typically reflects an immature immune system that hasn’t yet learned to keep the mite population under control. In adult dogs, sudden onset of demodectic mange is a red flag. It usually signals that something is suppressing the immune system: diabetes, cancer, long-term use of steroid medications, immunosuppressive drugs, chemotherapy, or other chronic illness. If your adult dog develops demodectic mange for the first time, your vet will likely investigate for an underlying condition driving it.
Corticosteroids deserve special mention. These anti-inflammatory drugs are commonly prescribed for allergies and other conditions, but they impair the immune response that normally keeps demodex mites in check. In some cases, steroid use can either trigger demodicosis or mask its symptoms while allowing the mite population to grow unchecked.
How Mange Is Diagnosed
The primary tool is a skin scraping. Your vet uses a blade to gently scrape the surface of affected skin, then examines the collected material under a microscope. For demodectic mange, the scraping needs to be deep enough to squeeze material from the hair follicles, sometimes until a tiny amount of blood appears. This sounds uncomfortable, but it’s quick and provides reliable results. Deep skin scrapings detect mites more reliably than hair plucking, which one study found identified mites in about 85% of samples compared to 100% for scrapings from oozing lesions.
Sarcoptic mange can be trickier to confirm. The mites burrow and are present in relatively small numbers, so scrapings come back negative in a significant percentage of cases even when the dog is infected. Vets often diagnose sarcoptic mange based on symptoms, exposure history, and response to treatment rather than relying solely on finding the mite under a microscope.
Treatment Options
Treatment has improved dramatically in recent years. A class of oral and topical parasite-control medications called isoxazolines has largely replaced older, harsher treatments. These drugs work by disrupting the mites’ nervous system while being well-tolerated by dogs. In clinical studies, the results have been striking: 142 dogs with sarcoptic mange treated with a single oral dose of one isoxazoline were all mite-free by day 56. Another study found that 100 dogs treated with either an oral or topical formulation of a different isoxazoline, also as a single dose, were completely clear of mites within the same timeframe.
Many of these medications are the same monthly chewables already marketed for flea and tick prevention, which means some dogs on routine parasite prevention may already have a degree of protection against sarcoptic mange.
For demodectic mange, treatment follows the same drug class but typically lasts longer. Antiparasitic therapy needs to continue not just until your dog looks better, but until skin scrapings come back negative on at least two consecutive tests taken a month apart. Some dogs respond quickly, while others need several months of treatment. The key is not stopping early, since mites hiding in follicles can repopulate if treatment ends too soon.
Localized demodectic mange in young dogs often needs only monitoring and basic supportive care, since most cases clear without intervention. Your vet may recommend treatment anyway to prevent progression to the generalized form.
What Recovery Looks Like
With sarcoptic mange, the itching usually starts to improve within the first week or two of treatment as mites die off. Full skin healing and hair regrowth take longer. Expect the skin to look rough, flaky, or discolored for several weeks even after the mites are gone.
Generalized demodectic mange requires more patience. Treatment commonly spans six to eight weeks at minimum, and some dogs need several months before their skin fully recovers. Hair regrowth is gradual, and in dogs with severe or long-standing cases, some scarring or permanent thinning of the coat is possible in heavily affected areas. Your vet will want to confirm cure through follow-up skin scrapings rather than appearance alone, since a dog can look improved while still harboring mites.
For adult dogs whose demodectic mange was triggered by an underlying disease, managing that condition is essential. If the immune suppression isn’t addressed, the mange is likely to return.
Can You Catch Mange From Your Dog?
Demodectic mange mites are species-specific and cannot infect humans. Sarcoptic mange mites, however, can temporarily transfer to people. The CDC notes that animal scabies mites can get under human skin and cause itching and irritation, but they cannot survive or reproduce on a human host. The rash typically appears as small, itchy red bumps on areas that had direct contact with the infected dog, like the forearms or abdomen. It resolves on its own once the dog is treated, usually within a few weeks, since the mites die without a canine host to complete their life cycle.
In the meantime, washing bedding and any fabric your dog regularly contacts in hot water helps reduce mite numbers in the environment. Scabies mites generally don’t survive more than two to three days off a host.