Supplementary Figure 1. The regression of the cube root of weight (y-axis) on to height at the withers (x-axis). Each point represents a breed and the resulting regression line is shown. The regression residuals (deviations along the y-axis from the regression line) are a measure of breed shape: positive residuals for breeds that are heavy for their height and negative for breeds that are light for their height. Several extreme breeds are indicated with triangle symbols and names.