Dog mange is a skin condition caused by microscopic mites that burrow into or live on the surface of a dog’s skin, causing intense itching, hair loss, and skin damage. There are two main types — sarcoptic mange and demodectic mange — with very different causes, transmission patterns, and treatment approaches. Understanding which type your dog has is essential, because treatment protocols differ significantly between them.
Types of Dog Mange
Sarcoptic Mange (Scabies)
Caused by Sarcoptes scabiei var. canis, a highly contagious mite that burrows into the skin to lay eggs. Sarcoptic mange spreads rapidly between dogs through direct contact and can also temporarily infect humans, causing an itchy rash (though the mites cannot complete their life cycle on humans and self-resolve within a few weeks). Wildlife — particularly foxes — are a common source of infection.
Symptoms: Intense, relentless itching (often disproportionate to visible skin changes early on); crusty, thickened skin on the ear margins, elbows, hocks, and face; hair loss beginning at these pressure points; secondary bacterial infections from self-trauma; emaciation in severe, untreated cases. The extreme itch is caused by an allergic reaction to the mites and their waste products — even a small number of mites causes severe symptoms.
Demodectic Mange (Demodicosis)
Caused by Demodex canis, a mite that normally lives in small numbers in hair follicles of all dogs without causing problems. When the immune system is unable to keep mite populations in check — as in puppies whose immune systems are still developing, or immunocompromised adult dogs — mites proliferate and cause disease. Demodectic mange is not contagious between dogs or to humans.
It appears in two forms: localized demodicosis (a few small patches of hair loss, usually on the face — common in puppies and often self-resolving) and generalized demodicosis (widespread hair loss, inflammation, and secondary bacterial infection across large areas of the body — requires aggressive treatment). Generalized demodicosis in adult dogs frequently signals an underlying systemic illness (hypothyroidism, Cushing’s disease, cancer) that must be identified and treated alongside the mange.
How Is Mange Diagnosed?
Diagnosis requires a veterinary examination. For sarcoptic mange, a skin scraping examined under a microscope can identify the mite, though the mites are notoriously difficult to find (only about 50% of cases yield a positive scraping). Because of this, many vets diagnose sarcoptic mange based on clinical signs and treat empirically — if the dog responds dramatically to treatment, the diagnosis is confirmed.
Demodectic mange is diagnosed by deep skin scrapings or hair plucks from affected areas examined under a microscope. Demodex mites are easier to find in good numbers. A newer technique, the trichoscopy (examining hair follicles under a video otoscope or dermoscope), is also increasingly used and is less invasive than scraping.
Dog Mange Treatment Options
Isoxazoline Medications (First-Line Treatment)
Monthly oral or topical isoxazoline preventives — Bravecto (fluralaner), NexGard (afoxolaner), Simparica (sarolaner), and Credelio (lotilaner) — have revolutionized mange treatment. Originally developed as flea and tick preventives, they are highly effective against both Sarcoptes and Demodex mites and are now the preferred treatment at most veterinary practices. They are given once monthly (or every 3 months for Bravecto) until consecutive skin scrapings are negative (typically 3–6 months for generalized demodicosis). Side effects are generally mild; they are used with caution in dogs with a history of seizures.
Lime Sulfur Dips
An older but effective topical treatment applied every 1–2 weeks. Lime sulfur dips are malodorous and stain fabrics but are safe for young puppies and pregnant dogs where isoxazolines may not yet be recommended. They remain a useful option in resource-limited settings or for very young patients.
Ivermectin / Milbemycin
Oral ivermectin given daily has historically been used for demodectic mange, though it requires weeks to months of treatment and carries significant risk in MDR1/ABCB1-mutant breeds (Collies, Shelties, Australian Shepherds, and related breeds), where it can cause fatal neurotoxicity. Milbemycin oxime (found in Interceptor) is safer in these breeds and is still used in some protocols.
Treating Secondary Infections
Secondary bacterial skin infections (pyoderma) are common with mange and significantly worsen the dog’s condition. These require concurrent treatment with antibiotics — topical (medicated shampoos, sprays) for mild cases, and systemic antibiotics for moderate to severe pyoderma. Medicated baths with chlorhexidine-based shampoos help reduce bacterial load and soften crusts.
Environmental Decontamination
For sarcoptic mange, wash all bedding in hot water, vacuum and treat carpets and upholstery, and clean all areas the dog frequents. Sarcoptes mites can survive off a host for 2–6 days, so environmental treatment helps prevent re-infection. All dogs in the household should be treated simultaneously. For demodectic mange, environmental decontamination is unnecessary as the mites require a host to survive and are not contagious.