Ever spot a squirrel with odd bald patches and wonder what’s going on? Most of the time, squirrels lose hair because of things like mites, fungal infections, or a crummy diet. Sometimes, stress or just plain old age can chip in too.
You can usually figure out what’s going on by looking at the skin, where the bald spots are, and how the squirrel acts. This helps you decide if you should call a wildlife rehabber or just leave the squirrel be.
Pay attention to whether the skin looks crusty, where the fur is missing, and if the squirrel seems agitated or sick. Those clues tell you a lot about what’s going on.
Common Medical Causes of Squirrel Hair Loss
You might notice patchy bald spots, red or crusty skin, or fur that’s thinning around the ears, belly, or tail base. These signs usually mean there’s a medical problem that needs some attention.
Mange Infections and Mites
Tiny mites cause most mange cases in squirrels. These little pests burrow into the skin and mess with hair follicles, making the squirrel super itchy. The usual suspects are Notoedres douglasi (in tree squirrels) and mites similar to Sarcoptes scabiei.
If you see a squirrel scratching like crazy, with thick crusts and spreading bald spots, it’s probably mange. Don’t try to handle it—call a wildlife rehabilitator. Treating mange needs a vet’s diagnosis and medicine, like special creams or shots. Out in the wild, mange can make squirrels weak and more likely to get hurt by cold or predators.
What to watch for:
- Nonstop scratching and restlessness
- Scaly, crusty skin near the ears, face, or tail
- Hair loss that keeps getting worse, maybe with weight loss
Fungal Skin Diseases
Fungal stuff like ringworm causes bald, round patches with flaky skin. These infections spread easily between animals, and sometimes even to people or pets—so definitely use gloves and let someone know if you’re dealing with sick wildlife.
Vets diagnose this with skin scrapings or fungal cultures. Mild cases get better with creams, but if it’s bad, they’ll use oral medications. Cleaning up nests and feeding spots helps keep the fungus from coming back. With the right care, squirrels bounce back in a few weeks, but if you ignore it, the infection can really knock them down.
Look for:
- Round, bald patches with flaky edges
- Itching and extra grooming in certain spots
- Spreading baldness where lots of squirrels nest together
Genetic and Inherited Conditions
Sometimes, a squirrel just has bad luck in the gene pool. Hereditary hair loss looks like even, non-itchy thinning—no sores or scabs. You’ll often spot this in several related squirrels or in a particular group in one area.
These squirrels don’t scratch much, and you won’t see open wounds. There’s nothing to treat, really, except making sure they have good food and shelter. If you notice a bunch of young squirrels with the same hair pattern, it’s worth telling local wildlife folks so they can keep track.
Other Factors Contributing to Hair Loss in Squirrels
Not all squirrel hair loss comes from infections. Sometimes, it’s about what they eat, the weather, or just getting banged up.
Nutritional Deficiencies
A lousy diet makes squirrel fur thin out or fall off. If they don’t get enough protein, healthy fats, vitamins A and E, or minerals like zinc, their fur turns dull and patchy. Young squirrels need tons of protein, while adults under stress burn through calories and fat just to keep their coats in shape.
If you’re feeding squirrels, skip the bread and sunflower seeds-only routine. Toss out a mix of unsalted nuts, seeds, fruits, and veggies. Wildlife rehabbers look at weight, muscle, and sometimes do bloodwork to spot deficiencies. Usually, a better diet and a little time help the fur grow back. In rough cases, rehabbers might add supplements or vitamin-rich formulas.
Environmental Stress and Trauma
Rough weather, nest disruptions, or fights can rip out fur in certain spots. Cold, wet winters leave fur looking thin, since squirrels use up energy just to stay warm. If pets, people, or predators mess with them, you’ll see bald patches and maybe some scabs.
Look for broken whiskers, torn skin, or fur missing from the back, neck, or tail. If you find a squirrel that looks stressed or hurt, don’t pick it up—call a wildlife rehabilitator. They’ll check for injuries, treat wounds, and suggest ways to make the area safer. Keeping predators away from nests helps cut down on repeated trauma.
Aging and Natural Causes
Older squirrels often start losing fur gradually. Their undercoats get thinner, too.
As squirrels age, their hair just doesn’t grow as fast. Their skin makes less oil, so you might see patchy fur even when there’s no disease at all.
Seasonal shedding changes as they get older. Sometimes, older squirrels shed more slowly or even unevenly in spring and fall.
You can usually spot aging by looking at their overall condition. Slower movement, leaner bodies, and worn teeth tend to show up along with thinning fur.
Most of the time, these changes don’t need any treatment unless the squirrel is hurt or really underweight. If you find an older squirrel that’s weak, orphaned, or just seems in rough shape, a wildlife rehabilitator can help.
