Fig. 2

Lineage purpose differentiation in English Greyhound and Labrador Retriever. a The English Greyhound sample clusters correlate with their stated purpose as given by the dog owner, but not with the geographical location (b). Dot colors in (a) according to sport and show or companion status and in (b) according to the country of origin. As the use of the dog for a purpose is not biologically determined, there are several examples (marked with lines) where the use does not correlate with the genotype. c As with the Italian Greyhound, the English Greyhounds contain four genetic clusters. Concomitant with the MDS, the show or companion dogs form a more uniform cluster than the racing dogs. The asterisk (*) points to an outlier individual, which genetically belongs to the racing dogs but has been tagged as a companion dog. d Similarly, the show lineage Labrador Retrievers form a tight cluster compared to the working dogs. For simplicity, only the US originating dogs were included in the analyses. The working dogs include various assistant and service dogs as well as dogs used for hunting. These did not, however, cluster by the specific type of use (e)