[Segovia]

My Australian Blue Heeler Cattle dog is descended from Dingos and Border Collies. Then in the 1930s some vet in Australia set about breeding his Heeler stock back to Dingos, didn’t turn out well, but it sort of proves that Dingos are wild dogs.

[glock rocks]

I have a blue heeler as well. I've been trying to determine his ancestry and have come up with a couple different stories. One take is that collies were bred with dingoes, another is that a Scottish blue merle Drover's Dog was. Here is a good discussion of both.

Here's an article with a picture from the era of a blue merle Drover's dog.