Sarcoptic mange, also called canine scabies, is caused by the mite Sarcoptes scabiei var canis. It is one of the itchiest skin diseases a dog can get, and it passes easily from dog to dog through direct contact. [1] People who handle an infested dog can also develop an itchy rash. [1]
This guide covers the signs, why diagnosis can be tricky, how vets treat it and what it means for the people in your home. For other mites, see why is my dog so itchy? and, for Demodex, hair loss in dogs.
Have a cat? See our guide to mange in cats.
How dogs catch it
The mite lives out its whole life cycle on the dog, going from egg to adult in about 17 to 21 days. The females dig into the outer layer of the skin to lay their eggs. [1]
Most dogs catch it through direct contact with an infested dog. Less often, mites are picked up from places or objects an infested animal has used, or from foxes and coyotes. Off the dog, mites can survive for a few days at room temperature, longer when it is cool and humid. [1]
Signs typically appear about a month after a first exposure, but another dog in the same home may not show signs for months. Sometimes only one dog in a household is affected, so a healthy housemate does not rule mange out. [1]
Signs of sarcoptic mange
The main sign is severe itching, which is not seasonal. The mites’ burrowing, substances they release and an allergic-type reaction to the mites all drive the itch, which is why even a few mites can make a dog itchy all over. [1]
- The first lesions are small, red, itchy bumps. [1]
- Later, thick yellow-gray crusts build up, especially along the edges of the ear flaps. [1]
- Scratching leads to hair loss, scrapes and raw patches. [1]
Where it starts. The typical spots are the ear edges, elbows, hocks, and the underside of the chest and belly. Not every dog has all of them. In long-standing cases the sores spread and can cover the body. [1]
Long-term cases. As the disease goes on, the skin can thicken and darken, redness can spread over the body, and lymph nodes may swell in severe cases. [1]
A simple sign vets look for: rubbing the edge of the ear flap often makes the dog kick a hind leg as if to scratch. This reflex supports the suspicion of mange but does not prove it. [1]
Why the mites can be hard to find
Mites, eggs or mite droppings are often missing from skin scrapings. The UMN handbook notes that scrapings come back negative in roughly half of dogs that do have scabies. [1]
A 2023 review makes the same point: the disease looks like other itchy skin conditions and the tests miss many cases, so a treatment trial is often how it gets confirmed. [2]
Our guide why is my dog so itchy? explains where this trial fits in the step-by-step itch workup.
What your vet will check
Your vet will ask about the history and look at where the sores are. Clues include an older dog with no past skin trouble that suddenly becomes very itchy, itching that does not settle with usual anti-itch care, and other pets or people in the home with similar signs. [1]
The vet will take several skin scrapings from the best spots, such as ear edges and red bumps on the belly. Finding a single egg counts as a positive result. In some countries a blood test for antibodies is also available. [1]
If the signs fit but no mites turn up, the handbook’s advice to vets is to treat anyway and see whether the dog improves. [1]
How it is treated
Your vet will choose the treatment. The general approach in the UMN handbook is: [1]
- Treat every dog in the home, even ones without signs.
- Treat the environment and replace the dog’s bedding.
- Anti-parasite medicine given by mouth or on the skin. Several modern options work well in trials.
- Breed matters. Some older anti-mite medicines are unsafe for collies, Shetland sheepdogs, Australian shepherds and related breeds, and a genetic test can check for this sensitivity.
- Itch relief may be given while the anti-parasite treatment starts to work.
Cats are rarely affected by the dog form of the mite, so they usually only need treatment if they show signs. [1]
A 2023 review of the evidence found that several classes of anti-parasite medicine given by mouth or by injection can clear both the mites and the signs, and that more head-to-head studies are needed to show which one works best. [2]
Can people catch mange from dogs?
Yes, it can happen. People in contact with an infested dog can get itchy red bumps, usually on the arms, neck and waistline. These tend to fade within about two weeks, but can last longer when there are many mites and close, repeated contact. [1]
A 2022 review of reported cases of scabies passed from animals to people found that dogs were by far the most common source among pet owners. [3] The review describes these episodes as usually short and self-limiting, though some case reports describe itching, and occasionally mites, lasting for weeks. [3]
If anyone in the home develops an itchy rash, they should see their own doctor and mention the dog’s diagnosis.
When to see your vet
Book a visit if your dog has:
- Sudden, intense itching
- Small bumps or crusted sores on the belly, chest, ear edges, elbows or legs
- Hair loss with thick, crusty or oozing skin
- Itching that started after contact with another dog
FAQ
Is sarcoptic mange the same as demodex mange?
No. Sarcoptic mange is caused by Sarcoptes scabiei and spreads easily between dogs. [1] Demodex canis is a normal resident of the hair follicles of dogs, and disease develops when it overgrows. [4] See hair loss in dogs for demodicosis.
My vet found no mites. Could it still be mange?
Yes. Scrapings miss the mites in about half of cases, so a dog with typical signs is often treated anyway, and a good response helps confirm it. [1] [2]
Do all the pets in the house need treatment?
All dogs in the home should be treated, along with the environment. Cats usually only need treatment if they show signs. [1]
How long until signs show after contact?
Usually about a month after a first exposure, though it can take months for another dog in the home to show signs. [1]
The bottom line
Sarcoptic mange causes sudden, intense itching, with crusted sores that usually start on the ear edges, elbows, hocks, chest and belly. The mites can be hard to find, so vets often confirm it with a treatment trial, and every dog in the home should be treated. It can spread to people, so ask your vet how to protect your household.
This article is for general information and is not a substitute for veterinary advice. If your dog is suddenly very itchy, please see your veterinarian.
Sources
- Torres SMF. 3.4 Canine Sarcoptic Mange. In: Small and Large Animal Dermatology Handbook, Vol. 1. University of Minnesota Libraries Publishing, 2025. CC BY 4.0. https://open.lib.umn.edu/animaldermatology/chapter/canine-sarcoptic-mange/
- Dumitrache MO, Cadiergues MC. The most effective systemic treatment in dogs with sarcoptic mange: a critically appraised topic. BMC Vet Res. 2023;19(1):189. PMID 37798627. https://pmc.ncbi.nlm.nih.gov/articles/PMC10552383/
- Moroni B, Rossi L, Bernigaud C, Guillot J. Zoonotic Episodes of Scabies: A Global Overview. Pathogens. 2022;11(2):213. PMID 35215156. https://pmc.ncbi.nlm.nih.gov/articles/PMC8877739/
- Torres SMF. 3.1 Canine Demodicosis. In: Small and Large Animal Dermatology Handbook, Vol. 1. University of Minnesota Libraries Publishing, 2025. CC BY 4.0. https://open.lib.umn.edu/animaldermatology/chapter/canine-demodicosis-new/