Erythromycin ointment is an anti-inflammatory drug that can be used to treat fungal infections in dogs, but it has a small effect. If you want your pet's skin disease to heal faster, it is recommended to use pet fungal infection drugs such as Petitfen Spray, Mingruining Spray. If your pet's skin is infected in a large area, it is best to shave the surrounding hair and take a medicated bath. Get treatment.