Mange in Dogs: Types, Treatment, and Welfare

Mange in Dogs: Understanding and Addressing a Welfare Problem

Mange refers to inflammatory skin disease caused by mite infestations, and represents a significant welfare concern in both companion and stray dog populations worldwide. Two main forms affect dogs — sarcoptic mange and demodectic mange — with very different causes, epidemiology, and welfare implications.

Sarcoptic Mange (Scabies)

Sarcoptic mange is caused by the mite Sarcoptes scabiei var. canis, which burrows into the skin to lay eggs. The resulting hypersensitivity reaction causes intense, relentless pruritus (itching) that severely impairs quality of life. Affected dogs scratch and bite at their skin constantly, causing self-trauma, secondary bacterial infection, and sleep deprivation from constant discomfort.

The condition is highly contagious — spreading through direct contact with infected animals. It can affect humans (causing temporary skin lesions that resolve without treatment). Wildlife populations, particularly red foxes, maintain reservoirs of infection.

Clinical signs: Intense pruritus, hair loss, thickened, crusty skin on ear margins, elbows, hocks, and ventral abdomen. Skin becomes secondarily infected, thickened, and hyperpigmented in chronic cases.

Diagnosis: Skin scraping for mite identification (low sensitivity), response to treatment, or serological testing (IgG ELISA).

Treatment: Selamectin, moxidectin, or fluralaner provide highly effective treatment. All in-contact animals and bedding must be treated simultaneously.

Demodectic Mange

Demodectic mange is caused by Demodex canis mites, which live in hair follicles normally. Immunosuppression — either genetic (juvenile demodicosis) or acquired (from concurrent disease) — allows mite populations to proliferate beyond control. Unlike sarcoptic mange, demodicosis is not contagious.

Localised demodicosis: Patches of hair loss and mild skin changes in young dogs; often self-resolving as immunity matures.

Generalised demodicosis: Widespread hair loss, follicular plugging, secondary bacterial pyoderma, and systemic illness. Significant welfare compromise from skin pain and systemic infection.

Treatment: Isoxazoline compounds (fluralaner, afoxolaner, sarolaner, lotilaner) achieve excellent cure rates for generalised demodicosis. Underlying immunosuppressive disease must be identified and addressed.

Welfare in Stray Dog Populations

Mange represents a major welfare crisis in stray dog populations globally. Untreated sarcoptic mange progresses to severe crusting, blindness, and death. Humane programmes combining treatment, neutering, and vaccination dramatically improve welfare outcomes for stray dogs.

Prevention

Regular use of ectoparasiticides (spot-ons or chewable tablets) prevents sarcoptic mange in companion dogs. Minimising contact with foxes and stray dogs reduces exposure risk. Annual veterinary health checks identify early demodectic disease and underlying immune problems.

This page is part of the Animal Welfare Hub — providing evidence-based information to improve the lives of animals. Return to home.