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I know what you're saying and imagine that the jury might still be out on this hypothesis until proven. The study that raised this used a mere 43 dogs. Unless you've got perfect eye line down the dog it's pretty tricky to gauge - but in lab (pun intended) conditions, it's a whole lot easier - as in the videos I've seen, there is a sweep - but with a little more emphasis on one side than the other.
I'm guessing such studies, if examined now, with the abilities of AI increasing at such a rate, we've got an even better chance of unlocking the language of our furry friends!
The study mentioned can be read, for free, at: https://www.cell.com/current-biology/fulltext/S0960-9822(13)01143-3
Thanks. I will look at the study now.
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I think it is!
It's really difficult to perceive outside of perfect conditions though isn't it...
In the real world, the park, it's even more difficult - plus we want to believe that all the dogs we meet love us!
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I never could understand the right wag, left wag distinction. They always seem to sweep both right and left, so I have trouble telling what kind of wag it is.