The Golden Retriever is a large, strongly-built breed with a dense water-repellant wavy coat.As a dog with origins in pedigree breeding, and due to its widespread historical popularity, some regional variations have emerged in the breed; therefore, there are three sub-types of the Golden Retriever that reflect the typical variations in dimensions and coat. However, all Golden Retrievers are blonde, yellow, or gold in colour and all sub-types are susceptible to the same health problems. Golden Retrievers also are very smart dogs who are loyal and friendly to their caregivers.