diversity in domestic dogs has originated through selective breeding
At the risk of invoking Godwin's Law, I'll answer you with "1933":
Always. The only difference is the agency doing the selection. The key facet of evolutionary theory is isolated populations facing different environmental challenges. The only difference here is that the "isolation" and selection "vector" are imposed by humans rather than Mother Nature.
The difference is how the selection is done. If the fittest survive to breed, whatever fittest might mean at any given time and place, then it's evolution. If the less desirable are culled or sterilized, while the more desirable; are allowed and encouraged to breed, it's selective breeding.
If the less fit and undesirable are allowed, encouraged, and subsidized to breed, it's liberalism.