My understanding is that the short-legged ones are the Dexters with the dwarfism genetics, so you would never breed two short-legged together as the genetics can cause the fetus to die in utero. But, not all Dexters with the dwarfism gene show traits like short legs. I believe for purebred and registration, all Dexters must be genetically mapped for breeding records to avoid breeding two with the gene together.I believe there was some discussion over the long legged and short legged and the crossing of them. Is this right? I wasn't at the conference for Cattle but had a good time just the same. I went because I have Delaware chickens. That part of the conference was a disappointment though. The folks were super and the food very good.