The Miniature Goldendoodle is not a purebred dog. It is a cross between the Golden Retriever and the Poodle; a Toy, Miniature or a small Standard Poodle. Some Miniature Goldendoodles are being bred as a first cross between a Golden Retriever and a Miniature Poodle. Some have Toy Goldendoodles. These two smaller sizes of Goldendoodles are achieved sometimes by surgical insemination or artificial insemination, but not all breeders perform this method of breeding. The resulting puppies may or may not be miniature in size. The theory is that they will be somewhere in-between the miniature poodle's size and the Golden Retriever's size. The best way to determine the temperament of a mixed breed is to look up all breeds in the cross and know you can get any combination of any of the characteristics found in either breed. Ask the breeder you contact which method of breeding they used to produce the Mini Goldendoodle. Not all of these designer hybrid dogs being bred are 50% purebred to 50% purebred. It is very common for breeders to breed multi-generation crosses.
Otis the F1 Mini Goldendoodle. "This is Otis in his first snow fall (he loved it!). He's 9.5 months old and weighs 36 pounds in this picture. He has not yet been professionally groomed, but his shaggy coat is very low maintenance (and we think it's very cute...)." Courtesy of Dreamdoodles.