Companion Dog Mange: Sarcoptic and Demodectic Types Compared

Mange in dogs causes significant skin disease and distress, with the two main types - sarcoptic and demodectic - having different causes, transmission, and welfare implications.

Key Facts

Sarcoptic mange (Sarcoptes scabiei var. canis) is highly contagious between dogs and can spread to humans (causing 'scabies')
Demodectic mange (Demodex canis) is caused by a mite that all dogs carry; disease occurs when immune function is impaired
Sarcoptic mange causes intense itching, hair loss, and skin thickening; it is transmissible at parks, kennels, and shelters
Demodectic mange typically causes localised hair loss in young dogs or generalised disease in immunocompromised animals
Both types cause genuine skin discomfort and distress if untreated
Sarcoptic mange requires quarantine of affected dogs; treatment involves acaricides
Demodectic mange treatment requires addressing the underlying immune deficiency where possible
Chronic generalised demodicosis in adult dogs often indicates underlying systemic disease

Welfare Considerations

Mange causes real welfare harm - sarcoptic mange in particular produces intense pruritus (itching) that profoundly affects quality of life. Affected dogs scratch constantly, develop secondary skin infections, and lose sleep to the relentless itch. Prompt diagnosis and treatment prevents this suffering from becoming prolonged. The welfare challenge is that mange is frequently misidentified or treated inadequately in its early stages. Any dog with new skin disease, hair loss, or intense itching should receive veterinary assessment including skin scraping to identify the type of mange, enabling targeted treatment that resolves the condition effectively.

What You Can Do

Seek veterinary assessment for any dog with persistent itching, hair loss, or skin redness
Isolate dogs diagnosed with sarcoptic mange from other dogs and seek treatment promptly
Treat all dogs in a household if one is diagnosed with sarcoptic mange
Report sarcoptic mange diagnosis to kennels or places where the dog may have been exposed
Follow complete treatment courses to prevent reinfestation or relapse of mange