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Researchers from the Chinese Academy of Sciences in Beijing watched dogs meeting a stranger over the course of three days, and noticed that as the dogs got to know the person they started wagging their tails more frequently to the right and less to the left.
Lead researcher Dr. Yong Q. Zhang says that right-sided wagging is linked to the left side of the brain where positive emotions are processed, so a dog wagging its tail to the right shows that the dog is feeling happy or comfortable. They analyzed a total of 21k dogs in the study, measuring their wagging with a 3D motion tracking system.
Source: Daily Mail