My Yorkie(5LBS) got a hershey kiss!!I am freakin out!! WILL THIS KILL HIM?

Please don't freak out. I am more worried about you! Your dog should be fine. While its true chocolate can be toxic to dogs and especially tiny dogs because they don't need to ingest as much to be a problem, it is the high end chocolate with a high cocoa content that is the culprit. Chocolate contains theobromine and the cheaper brands don't have as much as the higher end brands. Theobromine is what makes dogs sick.