Ringworm is a bit of a misnomer because this isn't actually a worm (unlike heartworms and tapeworms). Ringworm is actually a fungus, so named for its characteristic ring-like shape that presents as raised red bumps in a circular pattern. In dogs, since they have fur, you will notice actual hair loss in circular patches and a general disturbance in their coat as the fungus spreads around. Ringworm is spread by direct contact with the infected area, so a dog might spread it around itself and to other pets in the house. Humans can also develop ringworm. Luckily, the fungus is easily treated with topical or ingested medication. Simply use an over-the-counter anti-fungal cream, or see your veterinarian for a prescription shampoo, cream, or ointment. Remember, this can spread easily, so you need to stamp it out aggressively.