Ringworm is a fungal skin infection rather than a worm, and it spreads between pets and people through direct contact and contaminated bedding, brushes and furniture. Look for patchy hair loss, scaly or crusty skin and broken hairs, often around the face, ears and paws. It needs proper diagnosis, because several skin conditions look identical.
Why late August is when we see it
Two things line up at this time of year in a family neighbourhood like Clayton Heights. Kittens and puppies adopted over the summer have now been in their new homes for a few weeks, which is roughly how long it takes for a fungal skin infection acquired before adoption to become visible. And children are heading back to school, where close contact and shared spaces make the human side of the problem spread quickly.
Ringworm is also easy to sit on for a while. A small bald patch on a kitten looks like rough play or a scratch, and many owners understandably wait to see whether it fills back in. By the time it has not, the fungus has usually had several weeks to shed spores through the house.
The name is misleading in two ways
There is no worm involved at any point. The name comes from the ring-shaped lesion it sometimes produces on human skin, and that shape is the exception rather than the rule in pets. Expecting a neat circle is one of the main reasons it gets missed on animals.
The organisms responsible are fungi that feed on keratin, the protein in hair, skin and nails. They invade the hair shaft, which weakens it, so hairs snap off close to the skin and leave a patch that looks shaved or moth-eaten rather than smoothly bald.
What it looks like on a pet
- Patchy hair loss, often roughly circular but frequently irregular
- Broken, stubbly hairs at the edge of a patch
- Scaling, crusting or flaking skin, sometimes with a grey dusty look
- Redness, or small bumps around the affected area
- Brittle, misshapen or crumbling claws when the nails are involved
- Most commonly on the face, muzzle, ear tips, paws and tail, though it can appear anywhere
Itchiness varies enormously and its absence proves nothing. Some pets are intensely itchy and some are not bothered at all, which surprises owners who assume a skin problem must be uncomfortable to be significant.
Long-haired cats deserve particular mention. Some carry and shed the fungus without any visible lesion at all, which is how a household ends up with an infected child and a cat who looks perfectly healthy.
Who is most at risk
Kittens and puppies top the list, along with pets from shelters, rescues, catteries or breeding groups where animals are housed closely together. Older pets, those with other illnesses, and any pet on medication that suppresses the immune system are also more susceptible. Outdoor cats can pick it up from contact with other animals or from contaminated soil.
In people, children, older adults and anyone with a weakened immune system are more likely to be affected. In practice, this means a household with a new kitten and a school-age child is the classic scenario, and it is why sorting it out promptly is a family health matter and not only a pet one.
Several conditions look exactly the same
This is the reason to have it confirmed rather than assumed. Flea allergy dermatitis, other allergic skin disease, bacterial skin infection, mange and other parasitic conditions, and immune-mediated skin disease can all produce hair loss and scaling that is indistinguishable by eye.
Treating the wrong condition wastes weeks and can make things worse, especially if a product intended for one problem irritates skin that has a different problem. Our post on when to seek professional skin care for pets covers how these are told apart, and our guide to allergies in Surrey dogs covers the most common look-alike.
How it is confirmed
A physical examination comes first, including a careful look at the coat, the skin and the claws. An ultraviolet lamp is often used as a screening step, though only some strains glow under it, so a negative result there does not rule anything out. That limitation matters, because a quick lamp check is sometimes treated as conclusive when it is not.
Definitive confirmation comes from the laboratory, either by growing the organism from plucked hairs and scale or by molecular testing, alongside microscopic examination of the hair itself. That work runs through our diagnostic services, and results are interpreted alongside the examination during a medical consultation. Culture takes time, and starting a plan while results are pending is often appropriate.
Treatment takes longer than people expect
Treatment generally combines something applied to the coat with something given by mouth, both prescribed by your veterinarian, and it usually runs for weeks rather than days. Coat clipping is sometimes advised. Because handling an infected animal spreads spores, medicated bathing is often better done in a controlled setting, which is what our medical grooming service is set up for.
Two points cause most of the relapses we see. The first is stopping early. Skin that looks healed can still be shedding spores, which is why treatment is normally continued until follow-up testing is clear rather than until the coat looks better. The second is the environment. Spores survive in carpets, bedding, brushes, scratching posts and soft furnishings for a long time, so a treated pet returning to an untreated house simply gets reinfected.
Practical household steps include washing bedding and soft items in hot water, vacuuming thoroughly and disposing of the contents, cleaning hard surfaces with an appropriate disinfectant, replacing porous grooming tools rather than trying to salvage them, and confining the affected pet to an easily cleaned room where that is possible. Where several pets share a home, your veterinary team will advise on checking the others, since one may be carrying it without a mark on them.
Do not reach for a human antifungal cream from the bathroom cupboard. Products formulated for people are not automatically appropriate for a cat who will groom the area within minutes, and a partially treated infection is harder to identify afterward. Ask before applying anything.
Protecting the people in the house
Wash hands after handling the pet, their bedding or their bowls. Wear gloves for medicated baths where advised. Keep the affected pet off beds and out of children’s rooms while treatment is underway, and discourage face-to-face cuddling for the time being, which is a hard sell with a new kitten but worth it.
If anyone in the household develops a red, scaly, expanding patch on the skin or scalp, contact your family doctor and mention the pet. Human and animal treatment need to happen together, or the two keep reinfecting each other.
New arrivals are the best place to break the cycle. A check shortly after adoption catches this and much else before it establishes, which is part of what our wellness program is for. Our guide to your first months with a new puppy in Surrey covers what else that visit should include.
Frequently asked questions
Can I catch ringworm from my cat?
Yes. It passes readily between pets and people through direct contact and through contaminated bedding, brushes and furniture. Children and anyone with a weakened immune system are more susceptible. Wash your hands after handling an affected pet, and speak to your family doctor if a red scaly patch appears on anyone’s skin or scalp.
Is ringworm actually a worm?
No. It is a fungal infection of the hair, skin and claws, and the name refers only to the ring-shaped mark it can leave on human skin. That shape is uncommon on pets, where the more typical appearance is an irregular patch of broken stubbly hairs with scaling, so waiting for a neat circle means missing most cases.
How long does treatment take?
Usually several weeks, and sometimes longer. Treatment normally continues until follow-up testing shows the infection has cleared rather than until the skin looks normal, because a healed-looking coat can still shed spores. Stopping early is the most common reason a case comes back, so finish the course your veterinarian sets.
My cat has a bald patch but is not itchy. Could it still be ringworm?
Yes. Itchiness varies a great deal and many affected pets are not bothered at all, so comfort is not a useful guide. Some long-haired cats carry and shed the fungus with no visible lesion whatsoever. Any patch of hair loss that is not filling back in deserves examination rather than observation.
Do I need to treat my other pets?
Possibly. Ringworm spreads easily between animals sharing a home, and an apparently healthy pet can carry it. Your veterinary team will advise which household animals need checking or treating based on the species, the contact between them and the test results. Treating one pet while another quietly sheds spores is a common route to relapse.
Can I just use an antifungal cream from the pharmacy?
Please check first. Products made for human skin are not automatically suitable for an animal who will groom the area, and partial treatment makes the infection harder to identify on testing afterward. It also leaves the household environment untouched, which is where most reinfection comes from. Get the diagnosis confirmed and follow the plan you are given.