Snake-dog

A snake-dog was a magical crossing of a venomous snake and a dog domesticated by the yuan-ti that lived in the jungles of Chult.

Description
Snake-dogs were around tall at the shoulder, with an elongated body and a snake-like tail. Both their bodies and necks were about long. Their elongated, flattened heads were snake-like, except for their ears of. A snake-dog could unhinge its own jaw to allow it to swallow larger objects than would normally fit, and had rows of sharp fangs. It was covered in snake-like jungle-colored scales which helped its disguise in a jungle environment.

Behavior
The snake-dog was aggressive, but not overly so, fiercely protective of its own kind, especially towards females and young. It was able to swim well thanks to its snake-like qualities, helping it through the water. It had a venomous bite which it will use in a confrontation, as well as the ability to trip bipeds using its long neck. They could be trained to become effective defensive pets.

Diet
Snake-dogs ate small rodents, mammals and vermin. The long neck helped them to capture prey inside burrows.

History
It was not clear whether or not they were true descendants of the dog, but it was likely that they were the creation of a wizard rather than a natural evolution. Some of these snake-dogs also lived in the Vilhon Reach area, again in yuan-ti company, but they did not survive in city-like environments, requiring moisture and water in which to swim regularly.