The breed association I admire is that of the Kelpie. No physical breed standard, solely judged on ability.

I recall Jack Russels and heelers before they were recognized and bred to a physical standard. Before that they were best thought of as “types” rather than breed, and varied in dimensions quite a bit.

"...if the gentlemen of Virginia shall send us a dozen of their sons, we would take great care in their education, instruct them in all we know, and make men of them." Canasatego 1744