You can’t restrict a dog from romping in the woods and rolling on the ground. But since your dog’s favorite places may be ringworm infested, good hygiene and common sense will reduce the likelihood of infection.
Ringworm can be transmitted quite easily to humans, especially young children, and it is important to take appropriate steps to minimize exposure to the fungus while the dog is being treated.
You can read up more information in this in-depth article.