Encounter this in the snow biome. Found these bad boys in west zone 3 I assume, just chillin up north. If you find a pack, run. Run FAST. Make breaks behind a large creature like a bronto or diplo. Head to your base. If it still follows you, get the tranqs and it will run away.
If you ever encounter one in the wild, and you are in an early stage in the game, run the opposite direction. Also try not to agrovate it unless you are up to the KO/Fight.
Good luck if you encounter it!