Since in the public databases there are no SNPs described inside the CHST3 canine gene, in order to know if there were other SNPs inside the CHST3 gene more strongly associated to CHD, maybe a functional variant, we decided to sequence a chromosomic region of 5819 bp including the CHST3 gene and its 5’ upstream and 3’ downstream flanking regions in 39 Labrador retrievers (20 unaffected and 19 affected individuals) (Labrador retriever CHST3 Sequence NCBI accession number: JX402028.1). Here, CHST3 is linked to coronary artery disorder.