Relevant text:

Ukrainian crews say the fundamental problem is that the Abrams were built for advances aided by air power and artillery, which Ukraine lacks.

Russia, meanwhile, continues to make heavy use of drones in its attacks, which the Abrams struggle to defend against.

That’s a good point about disease and I think it could be a potential cause of the low genetic prevalence.

I don’t know about your roaming free option. I think if that were true, there would still be wild packs today or there would have been roving dog packs mentioned in historical text (possible but I don’t recall any mention of them). Alternatively, they would have inter-breed with European varieties and had a more significant impact on genetics, but that’s not seen.

While I agree that Europeans liked to remove/exterminate “uncivilized” things, that mostly applies to people. I suspect if the American dogs were significantly useful they would have made use of them.

This conversation allowed me to recall that the plains tribes utilized dogs as pack animals. Then once horses made their way onto the scene those tribes switched from dogs to horses for that role. I’m not sure what other “jobs” American dogs performed but I suspect if they were significantly utilized as pack animals they were probably breed for such and with that niche gone they may not have performed well in other “dog” tasks, compared to European varieties.

To conclude, for American dogs to be such a small percent of the current dog genome, I think, the European varieties had to significantly outlive their American counterparts. Whether because they were replaced by better performing European varieties/horses, because they died from European diseases, or a combination of those options.

After the arrival of Europeans, native American dogs almost completely disappeared, leaving a minimal genetic legacy in modern dog populations.

Source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7116273/

I did not do a very deep dive but it looks like there were “domesticated” dogs in the Americans prior to Europeans, but they were almost completely replaced by their European counterparts. This leads me to believe the European versions were far superior for the intended usage. If the American version was indeed significantly inferior for their intended purposes, they may have been at or below the effectiveness/usefulness levels of semi-domesticated animals, like foxes.

Edit: The_Sasswagon brings up a good point about the effects of potential European diseases on American dogs.