Canine Scabies (Sarcoptes) Mange

Skin & CoatDiseasesMeongsiljang Veterinary Advisory Board

Canine scabies is a parasitic infection caused by Sarcoptes scabiei mites burrowing and reproducing within the skin, leading to intense itching. Early diagnosis and precise deworming treatment are essential.

What Is Canine Scabies? Key Facts to Know

An illustration of a puppy scratching itself due to itching.

Canine scabies is a parasitic skin disease caused by the Sarcoptes scabiei var. canis mite, which burrows into the epidermis (stratum corneum) to lay eggs and reproduce. Early diagnosis is crucial. If your dog exhibits severe itching and hair loss around the eyes, ear margins, elbows, hocks, and abdomen, please visit a veterinarian as soon as possible. Scabies is highly contagious and can be transmitted to humans; therefore, failing to properly treat your dog may result in the entire family suffering from the condition.

Causes and Routes of Infection

Sarcoptic mange is caused by microscopic mites measuring 0.2–0.4 mm (200–400 μm). After mating, female mites burrow into the epidermis to create tunnels where they lay their eggs. The mites progress through four life stages: egg, larva, nymph, and adult. One complete life cycle, from egg to egg, takes approximately 14–21 days, depending on environmental conditions. This cycle repeats on the skin, allowing the mites to continue reproducing. - Direct contact transmission: The mites can spread immediately through play or close sleeping contact with an infected dog. - Environmental transmission: Indirect transmission via fomites such as fur, blankets, or grooming tools has also been reported. - Wildlife transmission: Infection can occur on walking trails where dogs come into contact with wild canids, such as foxes.

Main Symptoms Checklist

Unlike other skin conditions, sarcoptic mange is characterized by unbearable itching. If you notice two or more of the following symptoms, suspect sarcoptic mange: - Severe itching: Scratching and biting persistently, even to the point of sleeplessness at night - Hair loss at the ear tips: Hair falls out starting from the edges of the ears, accompanied by crusting - Rashes on elbows and belly: Red papules and crusts appear on exposed areas - Pinnal-pedal reflex: Scratching at the ear tip triggers a reflexive scratching response with the hind leg - Weight loss: Poor sleep due to itching leads to a rapid decline in overall condition

Early signs of mange — hair loss and scabs at the tip of the ear

Signs Requiring Immediate Veterinary Visit

If you notice any of the following signs, please visit a veterinary clinic within 24 hours. If left untreated, scabies can lead to secondary bacterial infections, prolonging recovery time and potentially spreading to you. - Itching persists for more than 48 hours and worsens over time - Pus or a foul odor is present on the skin - A rash spreads rapidly across the body - Red rashes appear on your arms or abdomen (possible zoonotic transmission) - Loss of appetite and lethargy are also present

Diagnostic Methods

Diagnosing sarcoptic mange can be surprisingly tricky. The mites burrow deep into the skin, making them easy to miss during testing. - Deep Skin Scraping: This involves deeply scraping several common sites, such as the elbows, hocks, and ear margins, to examine for mites, eggs, or fecal matter under a microscope. While it is the most definitive standard test, its sensitivity is low, yielding positive results in only about 50% of infected dogs. Therefore, a negative result does not rule out sarcoptic mange. - Pinnal-Pedal Reflex: If scratching the tip of the ear elicits a scratching response with the hind leg, it serves as a clue to suspect sarcoptic mange. - Trial Therapy: Even if no mites are visible, if the symptoms are typical, appropriate antiparasitic medication is administered, and the diagnosis is confirmed by observing whether the symptoms resolve. - Serology (ELISA): Although testing methods exist, they require further validation and are currently used only as an adjunctive tool in chronic suspected cases.

Comparison of Scabies Treatments

Item	Selamectin (topical)	Isoxazoline (oral)	Ivermectin (injection/oral)
Administration method	Applied to the back of the neck	Oral (treat form)	Injection or oral
Dosing interval	2–3 times at 2-week intervals	Once or once monthly	Determined by veterinarian
Onset of effect	24–48 hours	8–24 hours	24–48 hours
Ease of use for owners	True	True	False
Safety in Collies/Shetlands	Safe	Safe	Caution needed

The actual drug type, dose, and interval are decided by the veterinarian based on body weight and health status.

Treatment Process and Management

According to veterinary internal medicine textbooks, treating sarcoptic mange requires three simultaneous approaches: deworming, environmental management, and treatment of secondary infections. - Deworming: Isoxazoline-class drugs (such as fluralaner) are currently the first-line treatment. Topical medications like selamectin and moxidectin are also effective. - Treating secondary bacterial infections: If bacterial infections have developed in wounds caused by severe scratching, antibiotics should be used concurrently. - Relieving itching: Anti-inflammatory drugs like prednisolone may be used short-term during the first 1–2 weeks to reduce scratching. - Preventing transmission: All pets living in the same household must be treated together to prevent reinfection.

Administering a spot-on dewormer to the back of a dog’s neck

Home Management Tips

Managing your home environment is just as important as veterinary treatment. Sarcoptic mites can survive for 2–3 weeks on fur, blankets, and cushions. - Wash bedding and toys: Launder in water hotter than 60°C or dry them in direct sunlight. - Vacuuming and steaming: Steam clean carpets and sofas to eliminate mites. - Isolation: Minimize contact with other pets during the first two weeks of treatment. - Owner hygiene: Wash your hands thoroughly after handling your pet. If you develop a red rash, consult a dermatologist. - Follow-up appointment: A recheck in two weeks is necessary to confirm complete recovery.

Washing your pet’s bedding in the washing machine

Breed and Constitution-Specific Precautions

Herding breeds such as Collies, Shetland Sheepdogs, Australian Shepherds, and Border Collies may carry a defect in the multidrug resistance 1 (MDR1) gene. This genetic defect can cause severe side effects, such as tremors and coma, when these dogs are treated with certain dewormers like ivermectin and milbemycin. For these breeds, it is advisable to undergo genetic testing before selecting a dewormer or to use safer alternatives from the isoxazoline class or selamectin. You may also find our guide on canine MDR1 gene testing helpful.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

Can ringworm be transmitted to humans?

Yes, it can be transmitted to humans. While canine mange mites cannot survive long on human skin, they may cause red, itchy rashes on the arms, abdomen, and back. Once your dog completes treatment, these symptoms in owners typically resolve within 2–3 weeks. If the symptoms are severe, please consult a dermatologist.

How long does it take to treat mange?

Mild cases typically resolve within 2 to 4 weeks after one or two doses of dewormer. Severe cases or those with secondary bacterial infections may take 6 to 8 weeks to heal. Itching usually decreases significantly within 1 to 2 weeks of starting treatment, but a final diagnosis of recovery should be confirmed by a veterinarian through a follow-up examination.

How are sarcoptic mange and demodicosis (demodex) different?

Mange causes intense itching, whereas demodicosis typically causes little to no itching. Mange is highly contagious and can spread to humans, but demodex mites are commensal organisms that live on normal skin and are not contagious. Differentiation can be made through a deep skin scraping test.

Is it okay to continue walking?

During the first two weeks of treatment, keep your dog away from other dogs. Stick to short walks on routes with minimal foot traffic, and avoid dog cafés and parks until your vet confirms full recovery. After each walk, brush your dog’s coat and wipe it down with a pet-safe wipe to help remove any environmental mites.

What should I do if I have other pets at home?

All dogs living in the same household should be treated together, regardless of whether they show symptoms. Treating only one dog can lead to reinfection from untreated dogs. Although cats are less susceptible to canine mange mites, consult your veterinarian if they have frequent contact with infected dogs.

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References

[1] BSAVA Manual of Canine and Feline Dermatology, 4th Edition, Chapter on Ectoparasitic Diseases

[2] Principles and Practices of Canine and Feline Clinical Parasitic Diseases, Chapter 7

[3] Shoorijeh, S.J., Ghasrodashti, A.R., Tamadon, A. et al. (2008). Seasonal frequency of ectoparasite infestation in dogs from Shiraz, Southern Iran. Turkish Journal of Veterinary and Animal Sciences 32(4): 309-313

[4] Current Research in Parasitology & Vector-Borne Diseases 1: 100035 (2021)