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Figure 1.Examples of Breed Morphology Representing a Trade-Off between Speed and Strength
Dogs shown in (A)—Italian greyhound, Ibizan hound, and greyhound—have proportionately long, thin legs compared to those in (B)—bulldog, Saint Bernard, and mastiff—which have shorter, thicker bones. The colored box indicates the ratio of height at the shoulder in centimeters to weight of males in kilograms.
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Figure 2.Distribution of American Kennel Club Registrations by Breed in 2004
Nearly a million dogs are registered with the American Kennel Club each year. Though the total includes dogs from 154 breeds, most registrations represent a limited number of very popular breeds. The most popular breed, Labrador retriever, accounts for 15.3% of yearly registrations. This is greater than the 118 least popular breeds combined. Each breed on the chart above is represented by a colored block. The height on the y-axis indicates the number of dogs registered in 2004. The blocks are divided into six stacks indicating the percent of overall registrations acquired by that breed, as listed on the x-axis. Above each column is the percent of total registrations for all breeds in that category. Registration statistics can be found at http://www.akc.org/reg/dogreg_stats.cfm.
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Figure 3.The Population Structure of 85 Dog Breeds
The dataset includes five unrelated dogs from each of the 85 breeds that have been genotyped using 96 (CA)n repeat-based microsatellites that spanned the dog genome at an average density of 30 megabases. Clusters were obtained using the computer program Structure [69], which implements a Bayesian model–based clustering algorithm that attempts to identify genetically distinct subpopulations based on patterns of allele frequencies. The work is described in detail in [63]. Four distinct clusters described by Parker et al. are depicted as colored circles: cluster one is yellow, cluster two is blue, cluster three is green, and cluster four is red. Breeds associated with each cluster are listed within the appropriate circle, and examples of breeds are shown in the pictures. Some breeds show patterning similar to more than one cluster, and are listed in the overlapping space. Analysis is ongoing to expand the number of breeds in the dataset and to refine the clusters.
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