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Don't worry though, because Skipper - as she has been called - seems to be beating the odds to survive, and has given herself the best possible chance at living a healthy life.
Skipper is an Australian border collie cross, and was born six days ago at the Neel Veterinary Hospital in Oklahoma City, in the United States.
Now, stories of this type don't usually have a happy ending - but this one could just do, as the pup has been gaining weight well and has been showing some positive signs.
She was born with six legs - most noticeably - as well as two tails. Skipper also has a number of other facets that set her apart from her brothers and sisters, but more on those later.
The veterinarians' best guess is that she was supposed to have another sibling, but the foetuses didn't separate properly while they were in utero.
That means that Skipper has her sibling's extra limbs and tail.
All of the legs move independently and respond to stimulus, and she's eating well and growing at a normal rate.
It's not clear whether she'll need mobility aids or physical therapy later in her life, but everyone is fairly happy with how she's progressing and hopeful that she'll have the best possible chance at a normal existence.
Now, as well as the obvious things, Skipper also has - deep breath - congenital conjoining disorders called monocephalus dipygus and monocephalus rachipagus dibrachius tetrapus.
That basically means that she's got 'one head and chest cavity but two pelvic regions, two lower urinary tracts, two reproductive systems, two tails and six legs, among other things', according to the veterinary hospital's Facebook page.
She's also got signs of spina bifida along her back.
The sad news is that she's been rejected by her mother and needs feeding with a bottle, but - as we've said - she's doing pretty well, all things considered.
A GoFundMe page has been started by her owners to pay for any medical bills, surgeries, or vet visits that she might need in future.
She's gone home with them now though, although she'll be monitored by the hospital to 'help keep Skipper pain-free and comfortable for the rest of [her] life'.
Her organs appear to be in good nick, and she's all sorted in the toilet department now.
That's helpful, at least.
According to her owners: "She is moving well, eating well, and the potty issues have resolved.
"We are continuing to encourage her to build strength and she is pushing herself to do more.
"She is following a path to a happy and healthy life."
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