Mange in dogs is a skin disease caused by mites. The two main types are sarcoptic mange (canine scabies), which is contagious and intensely itchy, and demodectic mange (demodicosis), which is caused by mites every dog carries and is not considered contagious. Both need a veterinarian's diagnosis. When treatment is needed it is by prescription, and neither type can be reliably identified from a photo or cured with a home remedy.
This guide compares the two types side by side, explains how dogs catch mange, and lists the signs to watch for. It also includes a checklist that separates mange from fleas, allergies and ringworm, and a plain account of what vets do and do not know about diagnosis and treatment. If the signs do not quite fit mange, a rundown of common dog skin conditions and when to see a vet shows what else can look similar.
Sarcoptic vs. demodectic mange: the comparison table
The word "mange" covers more than one disease, which is why advice online often seems contradictory. The two types that matter most in dogs behave very differently, according to the Merck Veterinary Manual and the Companion Animal Parasite Council (CAPC).
| Feature | Sarcoptic mange (scabies) | Demodectic mange (demodicosis) |
|---|---|---|
| Mite | Sarcoptes scabiei var. canis, a burrowing mite about 0.2 to 0.6 mm long | Demodex canis (other Demodex species are rarer), which lives in hair follicles |
| Where it comes from | Contact with an infested dog or fox | Mites passed from mother to puppies in the first 72 hours of life; present in small numbers on normal dogs |
| Contagious to other dogs? | Yes, highly | Not considered contagious |
| Contagious to people? | Can cause a temporary itchy rash in people; dog mites do not complete their life cycle on humans | No |
| Typical itch | Intense, often sudden | Mild or absent in the small localized form; generalized disease is more severe, often with secondary infection |
| Where it usually starts | Ear margins, elbows, hocks, chest and belly | Small patches in young dogs; the whole body in generalized cases |
| Who gets it | Dogs of any age, especially after contact with other dogs or foxes | Mostly puppies and young dogs (inherited immune weakness), or adults with an underlying illness or immune suppression |
| How it is confirmed | Skin scrapings; mites are often not found, so vets may treat on strong suspicion or use an antibody test | Deep skin scrapings or hair plucks, which usually show mites in numbers |
| Outlook | Generally good with correct treatment of all in-contact dogs | Localized form often resolves on its own; generalized form needs months of treatment and the outlook is more guarded |
Table sources: Merck Veterinary Manual professional version (Dryden, reviewed March 2023, updated May 2025) and pet owner version (updated April 2026), and the CAPC sarcoptic mite guideline. The Merck owner version says localized demodicosis shows as 1 to 5 small hairless, red, scaly areas, mild or without itch.
What causes mange in dogs?
Mange is caused by mites, never by dirt alone. How a dog gets it depends on the type.
Sarcoptic mange: contact with an infested animal
Sarcoptic mites spread mainly by direct contact between dogs. Merck also lists combs, brushes, towels and blankets as possible indirect routes. CAPC adds that foxes and coyotes can act as reservoirs, and that the mite does not survive long off a host. The complete life cycle takes about 17 to 21 days on the dog. Seasonal larvae are a separate matter, and our page on harvest mites on dogs explains what to watch for.
Signs can appear anywhere from 10 days to 8 weeks after contact, according to Merck. CAPC notes that dogs become sensitized to the mites 3 to 6 weeks after infestation, and that dogs can pass the mites on during that quiet period. This is why a dog can look healthy and still be a source of infection. Other parasites cause trouble after outdoor contact too, and dog tick diseases and their symptoms explains the signs to watch. If the tick you find has already died, our guide to a dead tick on your dog explains what it means and what to do next.
Demodectic mange: an overgrowth of mites that were already there
Demodex mites are a normal part of canine skin. Disease happens when their numbers climb. Merck states that the full mechanism is not completely understood, that evidence for an inherited predisposition to the generalized form is strong, and that immune suppression (natural or caused by medication) can trigger disease in some dogs. In adult dogs, vets look for an underlying condition such as hyperadrenocorticism (Cushing's disease), hypothyroidism, diabetes or cancer, although in many cases none is found.
Breed matters. A US case-control study of 1,189,906 dogs (Plant, Lund and Yang, Veterinary Dermatology 2011, PMID 20707860, DOI 10.1111/j.1365-3164.2010.00922.x) found the highest odds of juvenile-onset generalized demodicosis in the American Staffordshire terrier (odds ratio 35.6), Staffordshire bull terrier (17.1) and Chinese shar-pei (7.2). The data come from 600 US hospitals in 2006, so they show association, not cause, and they may not match other countries. Breed shapes other skin problems too, and why Golden Retrievers have such itchy skin is one well-known example.
Other mites that cause "mange"
Vets also use the word for ear mites (Otodectes), "walking dandruff" (Cheyletiella) and chigger larvae (trombiculosis), per the Merck pet owner page. Owners who think chigger larvae may be involved can read more about whether dogs can get chiggers and which signs need a vet. Notoedres cati, which causes notoedric mange, is mainly a cat mite; the Merck professional chapter lists it under cats, and sarcoptic mange is rare in cats too. For a dog, sarcoptic and demodectic mange are the two to know.
Mange symptoms in dogs
Signs to bring to your vet, drawn from Merck, CAPC and the American Kennel Club (updated February 2026):
- Intense itching, scratching or chewing, often starting suddenly (sarcoptic)
- Hair loss, redness, small bumps and thick yellow crusts, usually first on the ear edges, elbows, hocks, chest or belly (sarcoptic)
- Patchy, red, scaly hair loss, sometimes with little or no itch at first (localized demodectic)
- Widespread redness, scabs, darkened skin, swollen lymph nodes, tiredness or fever when skin infection develops (generalized demodectic)
- Oily scale, skin thickening, weight loss and weakness in long-standing untreated sarcoptic mange
Merck warns that dogs that are bathed and groomed regularly can have "scabies incognito": they itch, but the crusts and scale that help vets find mites have been washed away. Because itching has other common sources, it helps to compare it with what dog flea bites look like and where they tend to show up. If you have spotted just one flea while checking the coat, our guide on what finding a single flea on your dog means walks through the next steps.
Mange, allergies, fleas or ringworm? A triage checklist
Itchy, patchy skin has many causes, and several look alike. The table below shows where each condition tends to appear according to the Merck Veterinary Manual. It cannot diagnose your dog. Overlap is common, and a dog can have more than one problem at once.
| Condition | Where it tends to show up | Clues from the source | What the vet may do |
|---|---|---|---|
| Sarcoptic mange | Ear margins, elbows, hocks, chest, belly | Sudden, severe itch; contact with other dogs or foxes; other pets or people in the home itchy | Several skin scrapings; antibody test; trial treatment |
| Demodectic mange | Small bald patches, or whole body in generalized cases | Young dog, or an older dog with an illness; mild or absent itch in the small localized form | Deep skin scrapings or hair plucks; checks for underlying disease |
| Flea allergy dermatitis | Lower back, tailhead, rear and inner thighs | Fleas or flea dirt, or no flea control | Flea comb exam; flea control for all pets and the home |
| Atopic dermatitis (environmental or food allergy) | Paws, face, ears, front-leg creases, armpits, belly | Chronic or recurring itch; Merck's diagnostic criteria describe the ear flap (but not its edge) and front paws, with the lower back usually spared | Diagnosis by exclusion of other causes of itch, including parasites |
| Ringworm (a fungal infection) | Face, ear tips, tail, feet | Bald, scaly patches with broken hairs; people in the home can catch it easily | Fungal culture, UV lamp exam, microscopy |
Sources: flea allergy dermatitis, atopic dermatitis and ringworm pages of the Merck Veterinary Manual, plus the mange chapter cited above.
Before the appointment, note these five things
- When the itch started and whether it came on suddenly or built up over months.
- Exactly where the hair loss, crusts or redness are (a quick phone photo helps your vet, but it will not replace testing).
- Whether other pets or people in the home are itchy or have a new rash.
- Recent contact with other dogs, boarding, grooming, rescue dogs, foxes or coyotes.
- Current flea and parasite products, and any medicine your dog takes, especially steroids. If a flea product seems to have stopped helping, this explanation of why flea treatment may not be working on your dog is a useful companion read.
Why the diagnosis should come before itch treatment
The Merck chapter says local and systemic corticosteroids are contraindicated in dogs diagnosed with demodicosis, and that sarcoptic mange cases are frequently "inappropriately treated as another type of allergic skin disease for weeks or months" before referral to a dermatologist. Steroid-responsive itch is part of the standard criteria for atopic dermatitis, so, in our reading, a good response to an anti-itch drug does not rule mites out. Do not give leftover steroids, antihistamines or any human medication to an itchy dog without veterinary direction.
How vets diagnose mange
The standard test is a skin scraping examined under a microscope. For sarcoptic mange, CAPC says the scraping must be deep enough to sample the full thickness of the epidermis and should turn the skin red without causing heavy bleeding. Several sites are sampled.
A negative result does not close the case. CAPC states that severe skin disease may be present even though repeated scrapings find no mites, and Merck says that concentration of several scrapings, fecal flotation and an antibody (ELISA) test can help. When mites are not found but signs fit, both sources describe response to treatment as a legitimate way to reach a clinical diagnosis. For demodicosis, the 2020 World Association for Veterinary Dermatology consensus guidelines (Mueller et al., Veterinary Dermatology 2020, PMID 31957202, DOI 10.1111/vde.12806) call deep skin scrapings the diagnostic gold standard.
How mange is treated
Treatment is by veterinary prescription. Doses, schedules and product choices depend on the type of mange, the dog's weight, breed, other medications and heartworm status, and they differ by country, so none are given here.
Sarcoptic mange
Merck and CAPC describe several drug classes. Selamectin and topical imidacloprid-moxidectin are labeled for sarcoptic mange in the US, per CAPC. Isoxazoline drugs (afoxolaner, fluralaner, sarolaner) are used off-label at flea and tick doses and are effective in published trials, for example fluralaner in 29 naturally infested dogs (Taenzler et al., Parasites & Vectors 2016, PMID 27387742, DOI 10.1186/s13071-016-1670-7) and sarolaner in a laboratory and a field study (Becskei et al., Veterinary Parasitology 2016, PMID 26928658, DOI 10.1016/j.vetpar.2016.02.017). Both trials were run by authors employed by the drug makers. Regulatory status varies by country and changes over time, so ask your vet what is licensed where you live.
CAPC does not recommend high-dose off-label ivermectin for sarcoptic mange because it can be toxic in ivermectin-sensitive dogs and failures have been reported. The US FDA has also alerted owners and veterinarians to possible muscle tremors, loss of coordination and seizures in some animals given isoxazoline-class products (communication dated September 20, 2018, updated 2019), another reason your vet should choose the product, particularly for a dog with a seizure history.
Every dog in contact with the patient is usually treated at the same time, per Merck, the Merck owner page and CAPC, because signs lag behind infestation. If a cat shares your home, fleas on cats are worth reading about as well, since parasite plans cover every pet. Our step-by-step plan on how to get rid of fleas on cats sets out how to treat the cat, the home and every other pet together.
Demodectic mange
Merck notes that localized demodicosis can generally be left untreated and often resolves by itself, while generalized disease requires treatment. Isoxazolines are now the preferred treatment for generalized disease in Merck's chapter, and the 2020 consensus guidelines state that amitraz, macrocyclic lactones and isoxazolines have all shown good efficacy. Treatment continues until at least two consecutive skin scrapings, one month apart, are negative. Some dogs respond fast; others need several months, and recurrence in the first year is not uncommon. Secondary bacterial infections are treated alongside.
Supportive care
Merck describes clipping hair and using antiseborrheic shampoo to remove crusts, and treating secondary bacterial and yeast infection; PetMD adds that a cone or suit may be recommended to stop self-injury. Bacterial skin infections that follow scratching have their own guide on pyoderma in dogs and how to stop relapses. These measures support the skin but do not replace mite-killing treatment.
Myths and facts about treating mange at home
| Claim | What the evidence says |
|---|---|
| "Motor oil kills mange mites." | We found no veterinary source that recommends it. The Merck Veterinary Manual says petroleum fractions were once used on ticks and mites, that small quantities on skin cause few or no harmful effects but large quantities and prolonged exposure can cause severe reactions, and that dogs ingest what gets on their fur when they groom. Older lubricating oils may contain toxic additives such as lead. Aspiration pneumonia from ingested oil is the most serious consequence, and Merck advises against inducing vomiting. If a dog is covered in oil, call a vet or poison helpline. |
| "Bleach baths cure mange." | Pet Poison Helpline lists bleach as a skin and eye irritant that can bleach and damage fur, may be corrosive in concentrated forms, and is commonly licked off and swallowed. Bleach used to launder bedding or clean surfaces is a different matter and is mentioned by some vets, but it never belongs on the dog. |
| "Mange means a dirty dog." | Merck describes "scabies incognito" in well-groomed dogs, and VCA Animal Hospitals notes sarcoptic mange can affect a dog of any age. Contact with infested animals, not cleanliness, drives sarcoptic mange. |
| "Only stray dogs get mange." | Shelters and rescues carry more risk, but any dog that meets an infested dog or fox can catch sarcoptic mange. Demodectic mange involves the dog's own immunity and genetics. |
| "Demodectic mange is just a puppy thing." | Merck describes adult-onset generalized demodicosis, typically in dogs older than 3 years and as young as 1.5 years, often linked to another illness. |
Sources: Merck petroleum product poisoning (pet owner version, updated September 2024); Pet Poison Helpline household cleaner guidance; VCA sarcoptic mange page. These sources do not test motor oil or bleach as mange treatments, so the table reports their toxicity warnings and the absence of any recommendation, not trial results.
Can people catch mange from dogs?
Sources phrase this differently, so here is the reconciled picture. Merck calls sarcoptic mange zoonotic. CAPC says people can develop a self-limiting infestation that is intensely itchy and usually clears without specific mite treatment, and recommends seeing a doctor if lesions persist. A European FECAVA fact sheet describes the result as "pseudo-scabies", with signs similar to scabies but no burrows and only short-lived infestation. The UK charity PDSA similarly says dog mites cannot survive on people for more than a couple of days but can cause a mild itch and rash until the dog is treated.
So a rash on you is plausible, usually temporary, and should be checked by a doctor if it persists. Demodex mites are host-specific and are not a risk to people. Ringworm, which can look similar on a dog, is easily caught by people (per Merck).
Outlook and recovery
Sarcoptic mange generally responds well to correct treatment (PDSA calls the outlook excellent when it is caught and treated early), though untreated cases can become severe, with skin thickening, weight loss and, rarely, death (Merck). Localized demodicosis often resolves unaided. Generalized demodicosis has historically had a guarded outlook, and recurrence in the first year is not uncommon. Mite-killing treatment takes time to work, and itch and hair regrowth lag behind mite clearance: in the fluralaner trial, mite counts fell 100% by four weeks while clinical signs improved at variable rates.
Preventing mange and protecting the household
- Avoid contact with dogs or foxes showing hair loss and crusts while a diagnosis is pending. CAPC says routine use of certain veterinary antiparasitic products likely prevents sarcoptic infestation, so ask your vet which parasite preventive suits your dog. To learn more about product side effects and regulatory facts, see how to choose the safest flea treatment for dogs.
- Treat the household as directed. If your dog has sarcoptic mange, your vet will usually include every dog in contact. If a cat shares your home and is scratching too, there is a separate guide to fleas on cats, including without a bath.
- Wash bedding, collars and grooming tools. Sources disagree about how long sarcoptic mites survive off a dog: CAPC says not long, ESCCAP's 2021 Swiss guide says 2 to 3 days, and ESCCAP's older German adaptation (2011) says two to three weeks under cool, humid conditions. Washing is a low-risk precaution either way, and your vet can tell you what else to clean. Cat owners dealing with a parasite problem may also want to see home remedies for fleas on cats and which ones to avoid.
- Do not breed a dog with juvenile-onset generalized demodicosis (Merck; WAVD guidelines), because genetics appear to play a role.
- Keep routine vet visits. Adult-onset demodicosis can signal another illness that needs attention. Changes in appetite or bathroom habits are also worth noting, and a guide to the signs and causes of a constipated dog explains when to call the vet.
When to see a vet
Book an appointment promptly for any dog with persistent itching, new hair loss, crusts or sores. Go the same day if your dog is lethargic, feverish, losing weight, off food, has widespread open sores or smells strongly of infection, or if a puppy is affected. Contact a doctor too if you or a family member develops an itchy rash.
What is still uncertain
- Why some dogs develop generalized demodicosis is not fully understood (Merck).
- How long sarcoptic mites survive off the dog is described differently by CAPC, Merck and two ESCCAP guides (2 to 3 days versus 2 to 3 weeks).
- Skin scrapings can miss sarcoptic mites (ESCCAP's Swiss guide says their sensitivity may not exceed 20%), so a negative result is not proof.
- Efficacy data for isoxazolines in sarcoptic mange come largely from manufacturer-sponsored studies, and regulatory approval differs between countries.
- No source we reviewed supports diagnosing mange from photographs alone.
Frequently asked questions
What is mange in dogs?
Mange is a skin disease caused by mites. In dogs the two main types are sarcoptic mange (scabies), which is contagious and very itchy, and demodectic mange, caused by overgrowth of Demodex mites that normally live on the skin. A veterinarian must diagnose which one is present.
Is mange contagious to other dogs?
Sarcoptic mange is highly contagious between dogs through direct contact and sometimes shared bedding or grooming tools. Demodectic mange is not considered contagious, because the mites are already on every dog.
Can humans get mange from dogs?
People can develop a temporary, itchy rash from sarcoptic mange mites, which usually fades once the dog is treated. Demodex mites do not affect people. See a doctor if a rash persists.
What does mange look like on a dog?
Sarcoptic mange typically causes intense itching with redness, crusts and hair loss on the ear edges, elbows, hocks, chest and belly. Demodectic mange often starts as small bald, red, scaly patches. Several other conditions look similar, so only testing by a vet can confirm mange.
How do vets diagnose mange?
Vets examine skin scrapings or plucked hairs under a microscope. Sarcoptic mites are often hard to find, so a negative test does not exclude mange, and vets may use an antibody test or a treatment trial.
Can mange be cured at home?
No home remedy is supported by the veterinary sources we reviewed. Motor oil and bleach can cause harm. Treatment needs prescription medication chosen by your vet.
How long does mange take to clear up?
Timelines vary. Generalized demodicosis may need several months of treatment, continuing until two skin scrapings a month apart are negative. Sarcoptic mange often needs repeat treatments over several weeks, and your vet will set the schedule.
Does mange go away on its own?
Mild localized demodectic mange in young dogs often resolves without treatment, according to Merck. Sarcoptic mange does not, and generalized demodicosis requires treatment.
Is mange an emergency?
Usually not, but it should be seen promptly. See a vet the same day if your dog is lethargic, feverish, not eating, losing weight or has widespread sores.
Sources used in this article
- Dryden MW. Mange in Dogs and Cats. Merck Veterinary Manual, professional version; full review March 2023, last updated May 2025. merckvetmanual.com
- Dryden MW. Mite Infestation (Mange, Acariasis, Scabies) in Dogs. Merck Veterinary Manual, pet owner version; last updated April 2026. merckvetmanual.com
- Companion Animal Parasite Council. Sarcoptic Mite (dog). Last updated March 13, 2019. capcvet.org
- Mueller RS, Rosenkrantz W, Bensignor E, et al. Diagnosis and treatment of demodicosis in dogs and cats: clinical consensus guidelines of the World Association for Veterinary Dermatology. Vet Dermatol 2020;31(1):5-27. PMID 31957202, DOI 10.1111/vde.12806.
- Plant JD, Lund EM, Yang M. A case-control study of the risk factors for canine juvenile-onset generalized demodicosis in the USA. Vet Dermatol 2011;22(1):95-9. PMID 20707860, DOI 10.1111/j.1365-3164.2010.00922.x.
- Taenzler J, Liebenberg J, Roepke RK, et al. Efficacy of fluralaner administered either orally or topically for the treatment of naturally acquired Sarcoptes scabiei var. canis infestation in dogs. Parasit Vectors 2016;9:392. PMID 27387742, DOI 10.1186/s13071-016-1670-7.
- Becskei C, De Bock F, Illambas J, et al. Efficacy and safety of a novel oral isoxazoline, sarolaner (Simparica), for the treatment of sarcoptic mange in dogs. Vet Parasitol 2016;222:56-61. PMID 26928658, DOI 10.1016/j.vetpar.2016.02.017.
- US Food and Drug Administration. Animal Drug Safety Communication: FDA alerts pet owners and veterinarians about potential for neurologic adverse events associated with certain flea and tick products. September 20, 2018 (updated 2019). fda.gov
- Merck Veterinary Manual: Flea Allergy Dermatitis in Dogs and Cats (last updated May 2026); Atopic Dermatitis in Dogs (last updated May 2026); Ringworm (Dermatophytosis) in Dogs (last updated June 2026); Petroleum Product Poisoning (last updated September 2024).
- Pet Poison Helpline. #StopBleachingFido: household cleaning product dangers. petpoisonhelpline.com
- FECAVA Working Group on Zoonoses. Sarcoptes (fact sheet, October 2022; French edition). fecava.org
- PDSA. Mange (sarcoptes mite) in dogs, PetWise Pet Health Hub, published August 2020. pdsa.org.uk
- ESCCAP Germany. Bekämpfung von parasitischen Milben bei Hunden und Katzen (German adaptation of ESCCAP Guideline No. 4, October 2011). esccap.de
- ESCCAP Switzerland. Modular guide MGL3: Ektoparasiten / Ectoparasites (French edition), December 2021, section 3.5b Sarcoptes scabiei. esccap.org
- PetMD (Grzyb K, DVM; reviewed by Morrison BJ, DVM). Mange in Dogs: Symptoms, Causes and Treatment. Updated September 27, 2024. petmd.com
- VCA Animal Hospitals. Sarcoptic Mange in Dogs. vcahospitals.com
- American Kennel Club. Mange in Dogs: Signs, Symptoms, Treatment. Updated February 17, 2026. akc.org
Veterinary disclaimer: This article is general information, not veterinary advice, and cannot diagnose or treat any condition. Skin disease in dogs has many causes that look alike. Have your veterinarian examine your dog before starting any treatment, and do not apply oil, bleach, human medication or leftover prescriptions to your dog's skin without veterinary direction. If you or a family member develops an itchy rash, see a doctor.