Snapchat Notification Sound

Hello! I have been searching for a way to change the sound that occurs when I receive a notification from Snapchat. It does not appear that I can do so from either my Apple settings nor my Snapchat settings. I have watched videos and read various support blogs, but nothing is working! I REALLY want to change it because it severely bothers my dog. He absolutely HATES the sound of it, but I do not really like having the sound off completely... APPLE, PLEASE MAKE IT POSSIBLE TO CHANGE THIS!