A miniature Labrador is a smaller than normal dog and does not qualify to the official breed standard of the Labrador retriever. It is not a recognized breed by either the American Kennel Association or the United Kennel Club.
The breed standard of a Labrador retriever requires that females stand 21 1/2 to 23 1/2 inches tall and male dogs stand 22 1/2 to 24 1/2 inches tall at the withers. Any variation of more than 1/2 inch is a disqualification, or fault.
Smaller Labrador retrievers and Lab hybrids may be produced by breeding smaller than average males and females to produce smaller dogs. Sometimes it involves crossbreeding Labs with small breeds, such as beagles or poodles, to produce labbes or labradoodles. While these are much loved pets, they are not miniature Labrador retrievers.