Canine Ringworm: Visual Identification

Ringworm, despite its name, is not caused by a worm. It is a fungal infection that affects a dog's skin, hair, and claws, according to Dutch. The fungi responsible are called dermatophytes, which consume keratin, a protein found in hair and nails. This infection can cause discomfort and visible changes in your pet's appearance. Recognizing these signs is crucial for prompt treatment and to prevent its spread.

Ringworm Appearance on Dogs

Ringworm characteristically manifests in several ways on a dog's skin. While the classic "ring" shape is often associated with the condition, its presentation can vary significantly. It's important to observe for a combination of symptoms.

Circular, Red Patches

One of the most recognizable signs of ringworm is the presence of circular or semi-circular lesions on the skin. These patches are often red and may appear raised due to swelling, as noted by Redmond vets. The "ring-like" shape is where the infection gets its common name.

Hair Loss (Alopecia)

Hair loss is a very common symptom of ringworm in dogs. You might observe circular or patchy bald spots (alopecia) in the affected areas. This occurs because the fungi digest keratin, weakening the hair follicles.

Scaly Skin

The skin within and around the ringworm lesions can become scaly. This scaling might resemble dandruff or dry, flaky skin. It's a result of the fungal activity on the outer layer of the skin.

Inflammation

Inflammation is a typical response to the fungal infection. The affected skin often appears reddened, a condition known as erythema. There might also be some swelling in the area, making the skin feel raised to the touch.

Brittle Hair

Hair in the infected regions can become dry and brittle. This makes the hair more prone to breaking easily, contributing to the patchy hair loss. The fungal invasion compromises the structural integrity of the hair shafts.

Darkened Skin (Hyperpigmentation)

Over time, if left untreated, the skin in the affected areas might undergo hyperpigmentation. This means the skin can become darker than the surrounding healthy skin. This is a common skin response to chronic inflammation or irritation.

Scabs or Nodules

In some cases, ringworm can lead to the formation of scabs or raised nodular lesions on the skin. These can be a sign of a more advanced infection or secondary skin irritation.

Itching

While not every dog with ringworm will experience intense itching, some may show signs of discomfort. They might scratch, lick, or chew at the affected areas, which can further irritate the skin and potentially lead to secondary bacterial infections.

Claw/Nail Involvement

Ringworm can also affect a dog's claws and the skin bordering the nails. This can manifest as inflammation around the claws or changes in the nail's appearance. If you notice any unusual changes in your dog's nails, it's worth consulting a vet.

Variability

It's crucial to remember that ringworm doesn't always present with the classic "ring" shape. The appearance can be quite variable, especially in the early stages or depending on the dog's coat type and immune response. Some dogs might only show patchy hair loss without a distinct ring.

Here's an example of what ringworm might look like on a dog's skin: