Mite Infestation
Mite infestations encompass several conditions caused by microscopic arachnids that parasitize the skin. Sarcoptic mange (Sarcoptes scabiei) causes intense itching and is highly contagious. Demodectic mange (Demodex) involves overgrowth of normal skin mites due to immune dysfunction. Other mites include Cheyletiella (walking dandruff) and ear mites (Otodectes).
Symptoms & Signs
- Intense itching (sarcoptic)
- Hair loss
- Crusty, thickened skin
- Red, inflamed skin
- Dandruff-like flaking (Cheyletiella)
- Ear scratching and dark discharge (ear mites)
- Secondary bacterial infections
Causes & Risk Factors
Sarcoptic mange: direct contact with infected animals. Demodectic mange: immune system failure allows normal Demodex mite overpopulation (genetic predisposition in dogs). Cheyletiella: contact with infected animals or environment. Ear mites: direct contact, common in young animals.
Diagnosis
Skin scraping with microscopic examination (deep scrapes for Demodex, superficial for Sarcoptes). Sarcoptic mange may require multiple scrapes (false negatives common). Response to treatment trial. PCR testing available for some species.
Treatment
Isoxazoline class (fluralaner, sarolaner, afoxolaner) highly effective for most mites. Ivermectin for sarcoptic and demodectic mange. Topical treatments (selamectin, moxidectin). Treat all in-contact animals. Environmental decontamination for Sarcoptes and Cheyletiella.
Prevention
Regular parasite prevention (isoxazolines cover mites). Avoiding contact with infected animals. Quarantine and treatment of new animals. Good hygiene and environmental management. Breeding away from generalized demodicosis.
Prognosis
Sarcoptic mange: excellent with appropriate treatment. Localized demodicosis: 90% resolve spontaneously in young dogs. Generalized demodicosis: good with modern treatments but may recur if underlying immunosuppression persists.
Affected Breeds (8)
| Breed | Species | Size |
|---|---|---|
| Atlas Beetle | Invertebrate | Small |
| Chilean Rose Hair Tarantula | Invertebrate | Small |
| Emperor Scorpion | Invertebrate | Small |
| Giant African Millipede | Invertebrate | Small |
| Greenbottle Blue Tarantula | Invertebrate | Small |
| Hercules Beetle | Invertebrate | Small |
| Madagascar Hissing Cockroach | Invertebrate | Small |
| Mexican Red Knee Tarantula | Invertebrate | Small |