Flashback Friday: What are dogs saying by wagging their tails? The language of left and right wags.

It has already been shown that dogs wag their tails asymmetrically when presented with different stimuli, and other dogs seem to behave differently when viewing left vs. right wags of robot tails . But do dogs actually have different emotional responses to viewing left vs. right-wagging dogs? To investigate this, several Italian scientists hooked dogs up to heart monitors and showed them movies of other dogs, some wagging to the left, and others wagging to the right. Interestingly, viewing d

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