My hamster ran away when I wasn't paying attention and was caught by my neighbor, but he didn't return it to me! What should I do?

If he really likes it, introduce him to a store that sells hamsters and let him buy it himself. He can’t escape. To be honest, I also hate this kind of people. They are unreasonable, but neighbors should keep in touch with each other. Get along well, this does not belong to him after all. Remember that evil people will not have good results! I hope you can get your beloved Shushu back soon.