Right, but they're no longer half dingo after the multitude of generations has passed in whichever pedigree, because for whichever innate temperament traits you might desire, along with the inability to selectively breed for physical ones with a wild dog, you wouldn't take a second generation heeler and cross a dingo back in just to keep the percentage up. I don't honestly know the whole history but it's conceivable that enough of the original breed starters contained sufficient "dingo" to keep the content up.

I thought I had read that one of the various tests...wisdom panel maybe...was providing results indicating wild crosses, including dingo. My thinking was that any significant percentage would show, but time will tell, since we have whichever brand that was, and just need to collect and run the sample.