I had to look up Kelpie, as this is a breed not familiar to me. Interesting looking dog, and one, I have not knowingly seen in person.
Do you breed for show or working? The separation reminds me of Border Collies and some other breeds as well. And somewhat the divide seems to be similar in terms of at least coat color n texture, and of course mayhap more subtle things I would not know of.
And your *large dogs* are not so large in my mind, although compared to Yorkies well they are, in fact anything other than another toy breed would be.
I do breed a large rare breed, full grown females 85-100lbs, males 110-130lbs or so.
And we do have show and performance breeders with our breed too, although we have not created different registries for this. The issue is almost always the same, if you don't breed for performance, then you lose over time the stellar performance qualities of the breed. And the other hand would say, we need to keep structure, type, coat, and other qualities true to the breed. It is a question without a definitive answer in my mind. But I have my own personal answer, and I am like some very few breeders who breed for both. Wrong temperament, no working drive, are as important to me, as coat type, structure and health. As a breeder you must if you want to do the above, test out your breeding stock, and do working titles on your dogs. As well as all the health screenings et al. That is a huge commitment of time and energy.
Anyhoo I have enjoyed reading your posts, and am looking forward to learning about this Kelpie breed of yours :-)