Restorative dentistry is often performed to treat defects including caries, fractures, access sites for endodontic therapy, and enamel lesions. Restorative materials can reestablish tooth function, restore esthetics, or do both. The objectives of restorative dentistry are to return (restore) teeth to optimum form and function, prevent further breakdown of the remaining tooth structure, to protect pulp tissue from thermal, mechanical, and bacterial insult, and to create a proper or aesthetic tooth appearance. Enamel defects in dogs can affect one or multiple teeth. This case report will focus on a single enamel defect affecting the non-occlusal surface of a mandibular first molar tooth. This case report includes descriptions of proper defect preparation and application of a flowable composite, and a review of composite materials used in restorative dentistry.