What is the probability of contracting ringworm from a dog?

Ringworm in animals: It is actually pretty likely that a person can get a fungal infection (ringworm) from a pet, such as a dog or cat. Cats and dogs with ringworm can look like they have areas of patchy hair loss on their skin. There is usually also flaking and itching. Fungal infections acquired from animals tend to be more inflammatory (more red and itchy) than those acquired from other humans.

Very possible: Ringworm or tinea fungal infection is commonly transmitted to humans from outdoor pets such as cats or dogs. Other sources are other humans, soil and wet environments such as showers and public pools and baths.