Length (FGF5 gene)
This gene determines whether a dog has a long (L) or short (S) coat. Goldendoodles will have long coat because both parent breeds are long-coated even though long coats are recessive. If a dog carries an allele for the short gene (S/L) their coat would be short. An example of this would be some early generation Labradoodles, whereas Goldendoodles do not.
Standard Poodle (Long Coat)
Golden Retriever (Long Coat)
Curl (KRT71 gene)
Goldendoodles can have curly, wavy, or straight hair. Typically, a Goldendoodle that is curly is +/+ for curl, whereas a straight-haired dog is -/- for curl, and a dog with wavy or loose curl is +/-.
Since a wavy Goldendoodle can carry a curl gene (+/-), two wavy Goldendoodles bred together can produce all three coat types.
Furnishings are the longer facial hair, including eyebrows, mustache and beard, found on most Goldendoodles. The lack of these furnishings, as seen in the golden retriever, is described as an incorrect coat. The gene that controls furnishings is dominant; so by testing the parent’s DNA, it can be determined if a breed pair will produce puppies that all have furnishings, or if there will be some puppies with an incorrect (Golden Retriever like) coat.
Dogs with these furnishings are lower shedding than dogs without them. If you have a family with allergies, a Goldendoodle with an incorrect coat is not the best match for. Although there is a market for Goldendoodles who look more like Golden Retrievers.
Please see the examples below of the different coat types for Goldendoodles: