Mange typically appears as patchy hair loss with red, irritated skin that progresses to crusty, scaly sores. The exact look depends on which type of mite is involved and how far the condition has advanced, but the hallmarks are unmistakable: thinning or missing fur, intense scratching, and skin that becomes increasingly rough and damaged over time. In severe cases, animals lose nearly all their hair and develop thickened, hardened skin sometimes described as looking like stone.
Sarcoptic Mange: The Intensely Itchy Type
Sarcoptic mange is caused by burrowing mites and produces some of the most dramatic skin changes. Early on, you’ll notice small red bumps and tiny blisters on the skin, along with relentless scratching. The itching is severe enough that dogs will scratch and chew until they create raw, open patches. As the condition worsens, those bumps give way to scaling, oozing, crusting, and thick scabs.
The location of the lesions is one of the easiest ways to recognize this type. Sarcoptic mange almost always starts at the ear margins, the outside of the elbows, and the hocks (the angular joints on the back legs). From there it spreads to the flanks and belly. The pattern makes sense: these are bony, thinly furred areas where mites gain a foothold most easily. Unlike human scabies, which leaves visible tunnel-like burrows in the skin, sarcoptic mange in animals does not produce those characteristic deep burrows, so you won’t see thin lines tracking across the surface.
Demodectic Mange: Patchy to Full-Body
Demodectic mange looks quite different and comes in two forms. The localized version is milder and far more common in puppies. It shows up as small, coin-sized patches of hair loss with silvery scaling, usually around the mouth, eyes, and front legs. The skin in those spots may be slightly pink but often isn’t dramatically inflamed. Some dogs barely scratch at all. Many cases of localized demodectic mange resolve on their own as a puppy’s immune system matures.
Generalized demodectic mange is a different story. By definition, it involves more than five separate sites on the body and can eventually cover entire regions. The skin becomes red, swollen, and scaly. The key feature is damage to the hair follicles themselves: you’ll see thick, waxy plugs around individual follicle openings, giving the skin a bumpy, rough texture. Left untreated for months, the skin develops crusty, pus-filled, bleeding sores, primarily on the head and limbs. Dogs with advanced generalized cases often lose most or all of their fur, and the exposed skin may be covered in redness, infections, and crusts.
What Advanced Mange Looks Like
Photos of rescued strays often show the most extreme end of mange. In these cases the skin has thickened so severely it appears leathery or armor-like, sometimes called “elephant skin.” Hair is completely gone over large areas, and the remaining skin is covered in oozing sores and heavy crusts. One well-known rescue case involved a four-month-old puppy found roadside in Tennessee, completely bald and covered with oozing sores and crusts so fragile that pieces of skin fell off when touched.
At this stage, secondary bacterial and yeast infections are almost always present, adding a foul smell and additional redness and swelling. Lymph nodes may become visibly enlarged. The animal is typically underweight and lethargic. While these cases look extreme, most respond well to treatment over several weeks to months, with fur eventually regrowing.
Mange in Cats
Cats get a distinct form called notoedric mange that has a very recognizable pattern. It starts on the ear margins and face, producing thick crusts, flaky skin buildup, and hair loss that gives the cat a rough, grayish appearance around the head. Without treatment, it spreads from the face down to the legs, chest, and belly, eventually covering the entire body. Like sarcoptic mange in dogs, it causes intense itching.
Cats can also be affected by a different mite that causes hair loss mainly on the torso and shoulder and hip areas. This type is driven by excessive licking rather than scratching, so the fur looks thinned or chewed rather than crusted. In severe cases, the licking creates open sores on the skin, with or without visible inflammation.
How Mange Differs From Ringworm and Allergies
Several common conditions can mimic the look of mange, which is why visual identification alone isn’t reliable. Ringworm, despite its name, is a fungal infection that typically produces circular patches of hair loss with a raised, scaly border. Mange patches tend to be more irregular in shape and accompanied by far more intense itching. Allergies can also cause hair loss, redness, and scratching, but allergic reactions often appear seasonally or after dietary changes and tend to affect the paws, armpits, and groin rather than the ear margins and elbows where sarcoptic mange starts.
A definitive diagnosis requires a skin scraping, where a veterinarian uses a blade to collect cells from the surface of a lesion and examines them under a microscope for mites or their eggs. Even this test isn’t perfect. Microscopic examination catches mites reliably when they’re present in large numbers, but sensitivity drops when mite populations are low, which is common in early or mild cases. Your vet may treat based on the pattern of symptoms and location of lesions even if scraping results come back negative.
Can Mange Spread to People?
Sarcoptic mange mites can temporarily transfer from animals to humans, producing an itchy rash on areas that had direct contact with the infested pet. On human skin, this appears as a cluster of small red, raised bumps with slight scaling, typically on the forearms, chest, abdomen, and thighs. The rash itches intensely and can develop oozing and crusting similar to what you see on the animal. However, animal-specific mites cannot complete their life cycle on human skin, so the rash is self-limiting and clears up once the pet is treated and the source of mites is eliminated.