The Wendigo is a creature that appears in the mythology of ancient peoples. Descriptions vary across cultures, but it is usually described as a huge beast like a dog, it is a malevolent and cannibalistic creature, and humans can become the creature have practices cannibalism. The person becomes possessed by the demon spirit creature during sleep, most of the times.
When possessed, the person becomes violent and is obsessed with eating human flesh.
The Wendigo are extremely violent, greedy creatures, always looking for new victims.