Ahuitzotl

There is a creature named Ahuitzotl ("water dog") of Aztec and Mayan myths. A similar creature is also mentioned in stories among the Hopi and Shasta tribes of North America. It might even be the same entity.

Described as aquatic, looking like a dog with marbled fur, small ears and with a hand on the end of its tail. It appears in shallow waters and gives the impression of being like a child at first when it appears. Then it makes a noise that sounds like a woman screaming or a child yelling. This would make people go looking for it without knowing they were being tricked. The gruesome Ahuitzotl liked to strangle its victims then eat them. Despite the dangerous nature of the Ahuitzotl, it was always considered guardian of lakes and friend of the rain gods.  

This suggests that the creature is possibly a cryptid and not just a mythical creature of legends. A conquistador named Hernán Cortés informed the king of Castile that a soldier was killed by the Ahuitzotl creature. It's believed that only priests should touch victims of a Ahuitzotl and bury them near water. If anyone else were to touch the dead, they would either become the next victim of the Ahuitzotl or end up being inflicted with gout. The spirits of those killed by Ahuitzotl would go to the afterlife realms of the rain god Tlaloc and goddess Chalchiuhtlicue.

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