Mange
Mange is a skin disease that develops as a result of animals being bitten by parasitic mites. It can occur in both dogs and cats, although dogs get mange more often than cats. This is the same type of parasitic infection as scabies in humans, and it involves the same two types of mites – demodectic and sarcoptic. Sarcoptic mange is worse because it is highly contagious, and dogs and cats can readily pass it to other pets. Demodectic mange, also called red mange, is not contagious.
Mange in Dogs
Sarcoptic mange in dogs is a serious concern for pet owners because it can also be passed to humans. Immediate treatment is important to prevent secondary bacterial infections, some of which can pose major health risks for dogs. Severe sarcoptic mange can also lead to emaciation or hypothermia. Dogs may develop demodectic mange due to genetic predisposition, bacterial infections, or a suppressed immune system.
Mange in Cats
The situation with either type of mange is similar for cats. The same two types of mites can bite cats, but in some instances, the mange symptoms – such as itching, flaking, skin inflammation, and hair loss – may be worse for cats than dogs. Cats can also develop types of mange that dogs typically do not get, such as Cheyletiellosis or 'walking dandruff mite,' which lives on the skin's surface rather than burrowing. Trombiculosis, or chigger mange, occurs when chigger mite larvae bite cats, causing redness, bumps, hair loss, and crusty skin.
Dog Mange Treatment
Topical treatment medications are the primary recommendation for dog mange treatment. Products containing Selamectin or Ivermectin effectively kill the mites causing mange. These medications work by poisoning the mites when they ingest the parasiticide via the dog’s blood. A lime sulfur dip may also be recommended, and an OTC pet hypoallergenic shampoo like Allergroom can provide immediate relief while prescription medications eliminate the mites.
Signs & Symptoms
- Intense itching and scratching
- Hair loss in patches
- Red, inflamed skin
- Crusting and scabbing on affected areas
- Thickened skin, particularly in chronic cases
- Sores and lesions
- Restlessness due to constant irritation
- Secondary skin infections (bacterial or fungal)
Anatomy
- Skin
- Hair follicles
- Epidermis
- Dermis
Cause
- Infestation by mites (Sarcoptes scabiei or Demodex spp.)
- Weakened immune system allowing mites to proliferate
- Direct contact with infected animals
- Poor living conditions or hygiene
- Genetic predisposition (particularly with Demodex in some breeds)
Diagnosis
- Skin scraping to identify mites under a microscope
- Hair pluck test to detect mites in hair follicles
- Biopsy in cases of severe or unclear symptoms
- Physical examination of skin lesions and affected areas
- Observation of response to anti-mite treatment