Puppy born with an extra tail on his head

An abandoned 10-week-old puppy, with an extra tail growing out of his head, was rescued in Missouri of the United States of America.

The puppy has been named 'Narwhal the Little Magical Furry Unicorn', and he was rescued by a non-profit rescue team that works with animals with special needs named Mac's Mission is rescued the puppy who has now become an internet sensation.

Narwhal the Little Magical Furry Unicorn - or Narwhal, for short - was found in rural Missouri along with a larger dog on Friday and brought to Mac's Mission on Saturday, reports USA Today.

He was found with an extra tail growing out of his forehead and a foot injury.

"So far we have not seen the tail on his forehead wagging," wrote Mac's Mission on a Facebook post.

Pictures and videos of Narwhal the puppy have gone viral on social media and also helped raise awareness of the rescue center's work.

Rochelle Steffen, who runs Mac's Mission, told BBC that the puppy "is in no pain and plays for hours".

One adorable video, shared on Facebook, shows the Narwhal happily prancing around and nibbling a rescue worker's finger playfully.

Steffen took Narwhal to Cape Small Animal Clinic to be examined, where the veterinarian said he had never seen a puppy like Narwhal in his 16 years of experience.

He informed that the extra tail is likely a congenital defect.

According to BBC, Mac's Mission has been told that there is no medical need to remove the extra tail as it causes him no pain.

However, Narwhal is not yet up for adoption, as the staff wants him to grow a bit more and truly make sure the tail doesn't become a bother or a problem.