Dogs are a common animal found worldwide, with a simplified genetic architecture due to domestication. ROH are genomic regions inherited from a recent ancestor and in humans are associated with numerous complex phenotypes, including height. Here, 722 canid whole-genome sequences were analyzed to characterize the genomic distribution of ROH among dog breeds and to test the relationship between ROH and phenotypic traits among breeds. We hypothesize that ROH is associated with body-size phenotypes in dogs.