You will not find reference on weststats because it is new. No new holiday quest was available on weststats prior to us solving it first.
The Tod's Sense was implemented in the 1.29 update. Like any other holiday set item, will be obtainable through a quest. Like any other holiday quest, it will be available during a holiday. So be patient and check your quests once in a while, specially before and during holidays. I suggest you make sure to check quests on Halloween.