Mange is a skin disease caused by microscopic mites that burrow into or live on the skin of mammals. It causes intense itching, hair loss, and crusted or thickened skin. Mange affects dogs, cats, foxes, coyotes, and dozens of other species, and some forms can temporarily spread to humans.
How Mange Works
Mange mites are tiny parasites, invisible to the naked eye, that feed on skin cells or the fluid beneath the skin’s surface. Depending on the type, they either tunnel into the outer layer of skin or camp out on its surface. Female mites lay eggs that hatch in three to four days and mature into adults within one to two weeks, so populations can explode quickly on a single animal.
The damage you see isn’t just from the mites themselves. Much of it comes from the animal’s immune system reacting to mite proteins and waste deposited in the skin. This allergic response is what drives the severe itching, redness, and inflammation that make mange so miserable. Symptoms typically appear four to six weeks after the initial infestation, once that immune reaction kicks in.
Types of Mange
Sarcoptic Mange (Scabies)
Sarcoptic mange is caused by the mite Sarcoptes scabiei, which burrows into the top layer of skin. It’s highly contagious and spreads through direct contact or shared bedding. In dogs, it usually starts around the ears, elbows, and belly before spreading across the body. Affected skin becomes intensely itchy, red, and crusty, and hair falls out in patches. This is the same family of mite that causes scabies in humans, though each variety prefers its own host species.
Demodectic Mange
Demodectic mange comes from Demodex mites, which actually live in the hair follicles of most healthy dogs in small numbers. Problems develop when a dog’s immune system can’t keep the mite population in check, allowing them to multiply out of control. This is why demodectic mange is especially common in puppies, older dogs, and animals with weakened immune systems. It can appear as localized bald patches (often on the face) or spread across the entire body in severe cases. Unlike sarcoptic mange, demodectic mange is not considered contagious between adult animals.
Otodectic Mange (Ear Mites)
Ear mites, specifically Otodectes cynotis, infest the ear canal and cause inflammation. They’re especially common in cats but affect dogs too. You’ll notice dark, crumbly debris in the ear that looks like coffee grounds, along with head shaking and scratching at the ears. Ear mites spread easily between pets that live together.
Walking Dandruff
Cheyletiella mites cause a condition sometimes called “walking dandruff” because the large flakes of skin they produce appear to move as the mites crawl beneath them. This type stays on the skin surface rather than burrowing and is less severe than sarcoptic mange, though it’s still uncomfortable and contagious.
Can Humans Catch Mange?
Yes, but with an important caveat. Sarcoptic mange mites from dogs can transfer to humans through close contact, causing an itchy rash. However, these animal-adapted mites can’t complete their life cycle on human skin. According to Cornell University’s veterinary college, the infestation in people is generally self-limiting and resolves once the dogs in the household are properly treated. True human scabies, by contrast, is caused by a human-specific variety of the same mite and requires its own treatment.
If you’re handling a mange-affected animal, wearing gloves and washing your hands and arms immediately afterward reduces your risk.
Mange in Wildlife
Mange isn’t just a pet problem. Sarcoptic mange has been documented in at least 148 species of wild and domestic mammals across 39 families, making Sarcoptes scabiei one of the most widespread skin parasites on the planet. The U.S. Geological Survey has classified it as an emerging wildlife panzootic, meaning outbreaks are spreading geographically and affecting more species over time.
Foxes, coyotes, wolves, wombats, and bears are among the wild animals hit hardest. For wildlife, mange can be fatal. Without treatment, the constant itching, skin damage, and hair loss leads to secondary infections, inability to regulate body temperature, and starvation. Mange outbreaks in vulnerable populations can threaten local conservation efforts.
How Mange Is Diagnosed
A veterinarian typically diagnoses mange by performing a skin scraping. This involves gently scraping the surface of the skin with a blade and examining the sample under a microscope to look for mites, eggs, or mite waste. For sarcoptic mange, the mites can be difficult to find because relatively few of them cause significant disease. Skin scraping catches about 90% of cases, so a negative result doesn’t always rule it out. Vets sometimes treat based on symptoms alone when mange is strongly suspected.
Demodectic mange is generally easier to confirm because the mites are present in much larger numbers within hair follicles, making them more likely to show up on a scraping.
Treatment and Recovery
Mange is treatable, and most animals recover fully. The approach depends on the type and severity. For sarcoptic mange in dogs, modern oral flea and tick medications in a class called isoxazolines have become a go-to option. These are chewable tablets that kill mites by disrupting their nervous system. Several are FDA-approved for dogs, and your vet can recommend the right one based on your pet’s size and health.
Demodectic mange in young dogs with only a few patches often resolves on its own as the puppy’s immune system matures. Generalized cases covering large areas of the body require more aggressive treatment and can take weeks to months to fully clear.
Ear mites are treated with topical medications applied directly to the ear canal, sometimes combined with an oral or topical anti-parasite product. All pets in the household typically need treatment at the same time, even if only one is showing symptoms, because mites spread before signs appear.
Cleaning Your Home
Sarcoptic mange mites can survive off their host for two to three days under normal conditions, and up to a week or more in cool, humid environments. They dehydrate quickly in dry, warm air. Temperatures above 122°F (50°C) or freezing below -25°C kill them reliably.
While the mites don’t infest your home the way fleas do, cleaning during treatment reduces the chance of re-infestation. Wash bedding, blankets, and any fabric your pet regularly contacts in hot water. Vacuum furniture and carpets, and dispose of the vacuum bag or empty the canister outside. Repeat this every few days during the treatment period. Items that can’t be washed can be sealed in a plastic bag for a week, which is long enough for any mites to die without a host.