Mange in Dogs: At a Glance
Mange is caused by mites — but the two types are very different in cause, contagion, and treatment.
Factor
| Factor | Sarcoptic Mange (Scabies) | Demodectic Mange (Demodex) |
|---|---|---|
| Cause | Sarcoptes scabiei mite — burrows into skin | Demodex canis mite — lives in hair follicles (normal in small numbers) |
| Contagious? | YES — highly contagious to dogs AND humans | NO — not contagious (immune system issue) |
| Itching | INTENSE — constant scratching, self-trauma | Mild to moderate — itching only with secondary infection |
| Hair Loss | Generalized, crusty, especially ears, elbows, belly | Patchy, often starts on face (especially puppies) |
| Diagnosis | Skin scraping (mites hard to find — treat based on symptoms) | Skin scraping (mites easy to find — large numbers) |
| Treatment | Isoxazoline (Bravecto, NexGard, Simparica) or ivermectin | Isoxazoline or amitraz dips; treat underlying immune issue |
Mange Treatment Timeline
Mange: Key Facts
| Sarcoptic mange IS contagious to humans (zoonotic) — causes itchy rash | |
| Demodectic mange is NOT contagious — caused by immune system weakness | |
| Localized demodex in puppies often resolves without treatment | |
| Generalized demodex needs treatment + investigation of underlying cause | |
| Isoxazoline flea/tick meds (Bravecto, NexGard) also treat both types of mange | |
| Sarcoptic mange is 'just dry skin' or allergies | |
| Demodectic mange means your dog is 'dirty' | |
| Humans can 'catch' demodectic mange from dogs |
Isoxazoline medications (Bravecto, NexGard, Simparica, Credelio) — originally developed for flea/tick prevention — are now the treatment of choice for both types of mange. They're safer, easier to administer, and more effective than traditional treatments like ivermectin or amitraz dips.
Sarcoptic mange (scabies) IS contagious to humans. If your dog is diagnosed with scabies, all in-contact dogs need treatment, and humans should see their doctor if they develop an itchy rash. The human rash resolves once the dog is treated.
Mange in Dogs: Sarcoptic vs Demodectic
One spreads between dogs fast. The other is about a weakened immune system.
petstore.comTwo mites, two very different problems
Sarcoptic mange
Highly contagious, intensely itchy, spreads through direct contact, worst at ears, elbows, and hocks
Demodectic mange
Not contagious, caused by a normal skin mite overgrowing, most common in puppies under a year
What to check before assuming which one it is
Two mites, two completely different problems that share a name
"Mange" covers two conditions that could not behave more differently. Sarcoptic mange, caused by Sarcoptes scabiei, is the version that spreads through a shelter or a dog park in days and makes a dog scratch until it bleeds. Demodectic mange, caused by Demodex canis, is caused by a mite that lives quietly on almost every healthy dog and normally causes no problem at all.
Sarcoptic mange is a contagion problem
Sarcoptic mites burrow into the skin and trigger an intense allergic-style itch response, and they spread easily between dogs through direct contact, a shared bed, a shelter kennel, even brief contact at a park. The itching is often severe enough that a dog is scratching non-stop, with hair loss and crusty skin developing fastest at the ear edges, elbows, and hocks. Sarcoptic mange can also cause short-lived, itchy bumps on people who handle an infected dog, though it does not establish a lasting infestation on human skin.
Demodectic mange is an immune-system problem
Demodex mites live in hair follicles on virtually every dog without causing any trouble, kept in check by a healthy immune system. Problems start when that balance shifts, most commonly in puppies under a year old whose immune systems are still maturing, producing small patchy areas of hair loss that often clear up on their own as the puppy matures. A more serious, spread-out form in adult dogs usually points to an underlying issue suppressing the immune system, and finding that underlying cause matters as much as treating the mites themselves.
The treatment path splits based on which one it is
A vet tells the two apart with a skin scrape examined under a microscope; sarcoptic mites are harder to find on a scrape and diagnosis sometimes relies on response to treatment, while demodex mites are usually easy to spot directly. Sarcoptic mange responds well to isoxazoline parasiticides or similar treatments, and every dog in contact needs treatment since it spreads. Demodectic mange in its localized puppy form often just needs monitoring, while the generalized adult form needs a longer treatment course and bloodwork to look for what triggered it.
What the clinical record distinguishes
The Merck Veterinary Manual separates sarcoptic mange, described as highly contagious with intense pruritus concentrated at the ear margins, elbows, and hocks, transmissible between dogs and capable of causing temporary itching in humans, from demodectic mange, described as caused by a mite present in normal skin flora that becomes pathogenic under immune suppression, most commonly affecting puppies in a localized form that is frequently self-limiting.