Ringworm, despite its name, is not a worm but a fungal infection that affects the skin, hair, and nails of dogs (and other animals, including humans). It is caused by various species of fungi known as dermatophytes. The infection is characterized by circular patches of hair loss, which can become red and inflamed. Dogs with ringworm may also exhibit symptoms like itching, scabbing, and flaky skin.

### How Ringworm Affects Dogs:
1. **Transmission**: Ringworm is highly contagious and can be spread through direct contact with an infected animal or indirectly through contaminated objects such as grooming tools, bedding, or furniture.

2. **Symptoms**: Look for signs such as:
- Circular patches of hair loss
- Red, scaly, or inflamed skin
- Itching or discomfort
- Broken hairs or bald spots

3. **Diagnosis**: A veterinarian can diagnose ringworm through physical examination, Wood's lamp examination, or fungal culture tests.

4. **Treatment**: Treatment usually involves antifungal medications, topical treatments, and thorough cleaning of the dog's environment to prevent reinfection. It’s important to follow your vet's instructions carefully.

5. **Prevention**: To prevent ringworm, maintain good hygiene for your dog, avoid contact with infected animals, and regularly clean your dog's living area.

If you suspect your dog has ringworm, it’s essential to consult your veterinarian for proper diagnosis and treatment options.

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Topics covered in this question:

Dog Health Dog Grooming Pet Care Ringworm Fungal Infection