Does a wagging tail indicate a dog is happy?

Not necessarily, according to the pooch-loving boffins behind TailTalk, a sensor that sits on Fido’s tail to track his daily ups and downs. The emotional data is transmitted to an app on your smartphone, allowing you to learn what makes your hound happy, and what causes him stress. Experts claim tail-wagging signals behavioural nuances that dogs understand but humans do not always recognise. Left wagging usually indicates negative feelings like anger or aggression, while right wagging typically demonstrates that your pooch is excited.

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