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Forget smiling, next time you're feeling overly jovial why not slap on a wagging furry tail?

A quirky designer in Japan has created a prototype for a fully-functioning tail, which monitors a person's heart rate and wags faster the more excited they become.

Creator Shota Ishiwatari is hoping to raise over $90,000 on crowd-funding site 'Kickstarter.com' to launch his wacky product.

A belt with sensors to monitor a person's heart rate is used to make the tail move. Source: Kickstarter.com

Known as a 'Tailly', Ishiwatari believes the fluffy accessory will help spread happiness and says it could even aid singles looking for love.

"Tailly is fun to wear to parties, while out with friends or playing with kids. You could even wear Tailly on a date and express your true feelings through the wagging tail," he said.

"Even better, your partner could also wear one for the both of you to add a level of subconscious communication."

The basic colour of the tail is white, but if that doesn't take your fancy the fashion-conscious designer is also offering tail covers in black, grey and a stylish golden brown.

The Tailly will be available in four different colours. Source: Kickstarter.com

A YouTube video showing how the product works has attracted mainly negative comments, with one user saying 'What has science done'.