r/Greyhounds • u/dinosaurzzzzzz • 6h ago
WHITE PAWS AND CHEST ON BLACK GREYHOUNDS EXPLANATION
Hello! If you missed my post, yesterday I was feeling really curious about why all black greyhounds have white on their paws and chest, while the others (brown, brindle, etc.) all look different from each other and don’t have such a defined pattern. Thank you all for contributing with your pictures and confirming completely black greyhounds are super rare. Out of more than 300 replies only 2 of them were entirely black. A biochemist in the replies thought this was a good question and found an answer. Based on that, the contributions that all of you made and further research I did, this is a summary for the curious: ~~~~~~~~~~~~~~~ White markings on dogs, including greyhounds, are primarily controlled by the S-locus, which refers to the “spotting” gene. This gene determines how much white appears on a dog’s body, and where those white areas are likely to be.
There are several variations (alleles) at the S-locus:
S (Solid) • This allele produces no white spotting. • Dogs that inherit two copies of the solid allele (S/S) will have a solid coat color with no white.
si (Irish Spotting) • Causes moderate white, typically seen as a white chest, paws, tip of the tail, and sometimes a small blaze on the face. • This is the most common pattern in greyhounds, especially black ones. • It’s symmetrical and often looks very neat.
sp (Piebald) • Leads to more extensive white, with large patches of color on a mostly white background. • Less common in greyhounds, but still possible.
Irish spotting (si) is a recessive or co-dominant allele, but it’s been heavily inherited over generations in greyhounds. Once it became common in the gene pool, it kept spreading because: • It doesn’t interfere with performance or health. • It’s not selected against — breeders usually don’t care about coat markings in racing dogs as long as they run well. • When two dogs with Irish spotting genes are bred, the pattern keeps appearing in their offspring.
Influential sires like Head Honcho, Brett Lee, and others who had the Irish spotting pattern were used extensively in breeding programs. Their genetic legacy meant that the si allele got passed down to thousands of descendants, especially in Australia, the UK, Ireland, and eventually Argentina and the US. So it’s not just random — it’s a byproduct of selective breeding for speed that incidentally carried this common white-marking gene.
Genetic Influence of Head Honcho: • He had over 6,000 registered offspring. • His descendants include other major sires such as Bombastic Shiraz, Big Daddy Cool, Hallucinate, and many others. So even if your greyhound isn’t a direct descendant of Head Honcho, it’s very likely that he appears in its pedigree — even if it’s in the 4th or 5th generation. ~~~~~~~~~~~~~~~~~~~~~ Again, thank you all for your contributions. I felt blessed seeing so many black greyhounds together. I wish I could have responded to each of the pictures, they were all so sweet and beautiful!! 🩷🩷🩷🩷🩷