Tujia dog is a small hairless beast that only lives in the southern United States. Before humans settled in the southern United States, Tujia's natural enemies were not strong, so Tujia thrived in the southern United States. When humans began to hunt them, Tujia dog became extinct. 
In the southern United States, people hunted another mammal that is easy to be preyed on by natural enemies, but has never been extinct
 it must be people's minefields that led to its extinction.