Medicated dog shampoo is a grooming product that targets certain skin disorders or dermatological concerns in dogs. These shampoos often contain active chemicals designed to reduce skin-related complaints such as itching, irritation, infections, and allergies. 

It's essential to follow the product's instructions carefully and to monitor the dog for any adverse reactions. If there is no improvement or if the condition worsens, veterinary advice should be sought for a comprehensive evaluation and treatment plan.