Don’t use this as a bedtime story especially if you are camping.
Once upon a time, a mountain lion attacked a dog near Preston, Idaho. It was tracked by a hunter and killed near the Utah border. Upon retrieving the carcass, it was discovered that the predator had a second set of fully formed teeth and whiskers growing out of the top of its head.
It is such an anomaly that it can only be surmised to be the remnants of a parasitic twin that died in the womb and was absorbed into the other fetus, or the deformity is a teratoma tumor which can grow teeth and hair.