[scaradim]

I would like to highlight the Competing Interests claim of the article: "The authors declare that they have no competing interests." This is for sure a particularly necessary condition for issuing such high quality research on such delicate topic. It moves me to next level as a dog owner: I'll pet my dogs only when oriented E-W in order to avoid 'accidents' - I've already realigned properly my furniture around in the house.

I would note that, as per my last experience with a litter, I realize now that this is result of the forced education from the dam with an (still) unknown evolutionary purpose. Reluctant E-W-oriented puppies would turn in rounds hoping their mother/dam is not watching when selecting the wrong orientation. But each non-N-S-oriented poop position would get punished immediately with a bite. Most dogs remain with sequelaes in adult life, searching in rounds for the spot for minutes, repressing their inner E-W poop identity. I note that we used the dam to teach my young sons geography. Yes, still room to investigate this vein...

I'm glad that my country and all world can benefit from such research done abroad.

I hope no animal/human gets hurt by above inspiration moment at end of my hard work day. I apologize proactively closing my computer. My two dogs wait for me looking in a particular direction...