An F1 black Labradoodle is the first-generation cross between a purebred Labrador Retriever and a purebred Poodle, typically resulting in a 50/50 genetic split from both parents. An F1b black Labradoodle is a cross between an F1 Labradoodle and a purebred Poodle, giving the F1b Labradoodle a higher percentage of Poodle genetics, often making it more hypoallergenic with a curlier coat.