blahblahshaw asked: As someone who works on a (purebred) breeding farm, but who also works at a regular old lesson facility with a bat-shit insane BYB for an owner, I would like to comment re: BYB Definition. I would classify a Backyard Breeder as anyone who does not possess a formal understanding of the science of equine genetics. You can Google 'chosing' + 'breeding' + 'stock' all you want, but it does not make you a geneticist. Leave it to the pros.