Sarcoptic Mange

Sarcoptic mange, usually called scabies, is a skin disease caused by a microscopic mite named Sarcoptes scabiei var. canis. Female mites tunnel into the outer layer of your dog's skin to lay their eggs, and the whole life cycle, around two to three weeks, happens on the animal itself. Most of the misery comes from the immune system reacting to the mites and their waste products, which is why even a small number of mites can leave a dog frantically itchy. The itch is relentless and does not come and go with the seasons.

Thinly haired areas tend to be hit first: the edges of the ears, elbows, hocks, chest and belly. You will often see redness, small crusty bumps, scratching and chewing that never seems to stop, and hair loss where the skin has been traumatised. Left untreated, the skin can thicken and darken, and broken skin invites secondary bacterial infection. Because the signs overlap with allergies and other skin conditions, sarcoptic mange is worth ruling out rather than guessing at.

Scabies spreads easily between dogs through direct contact, and also via shared bedding, brushes and towels. Foxes are a common source in many regions. The mite is zoonotic, meaning people in the household can pick it up and develop itchy red bumps, though it does not properly establish itself on humans and usually settles once the dog is treated. Anyone with a rash should see their own doctor rather than a vet. Sarcoptic mange is very rare in cats, which are more often affected by a related mite, Notoedres.

How it is diagnosed and treated

Your vet will typically take deep skin scrapings and look for mites under the microscope. Mites are genuinely hard to find, especially early on, so a negative scraping does not clear your dog. Recognised veterinary sources, including the Companion Animal Parasite Council, support treating on suspicion when the clinical picture fits, and a good response to anti-mite treatment then supports the diagnosis.

The good news is that this is a very treatable condition. Several spot-on products, including selamectin and moxidectin combined with imidacloprid, are licensed for sarcoptic mange in dogs, and the newer isoxazoline products such as fluralaner, sarolaner and lotilaner have shown high cure rates in published studies. Lime sulfur dips remain a safe option for very young animals. Which product is appropriate depends on your dog's age, weight, health and what is licensed where you live, so this is a prescription decision for your vet, not a shelf purchase.

Two points matter as much as the medication itself. Every dog in the household needs treating, including any that look perfectly fine, and bedding and grooming tools should be washed thoroughly. Expect the itch to take a few weeks to fully settle, and mention it to your vet if it does not, since secondary infection or an underlying allergy may also need addressing.