"Dogs can pick up emotional cues from another dog by watching the direction of its wagging tail, a…
"Dogs can pick up emotional cues from another dog by watching the direction of its wagging tail, a study suggests.These results suggest that dogs have perceptual and attentional asymmetries so for example, if you are going to visit a dog, if you are vet, there will be probably a side which is better with respect to the probability to evoke a more friendship response or to evoke a more aggressive response,"," says Vallortigara https://www.npr.org/2013/11/01/242126859/the-tails-the-tell-dog-wags-can-mean-friend-or-foe
The Tail's The Tell: Dog Wags Can Mean Friend Or Foe
Is that a left wag or a right wag? Scientists have previously shown that dogs tend to wag their tails to their right side when they see something friendly, like their owners. But a new study shows that other dogs can actually pick up on these emotional cues.