"He was a hero, I just couldn't see it."

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I like the way he stand there after killing it twice, thinking his work is done, and suddenly his right ear flips up as if to say, it's not over yet  

I think the dog is just curious about the devil! the sun warmed ground with cooler air above allowed the dust devils vortex to continue spinning even as the dog was interrupting direct sunlight from continually heating the gravel