Transportation Security Administration released its 2021 calendar - for free - and it features hard-working canines that work at airports nationwide. (AP Photo/Eric Risberg, File) By: Sarah Dewberry ...

If you want the perfect dog Christmas gift for 2021, these dog Advent calendars fit the bill. From treats to toys, your pup will appreciate these options.

The calendar has 12 punch-out dates on it, and behind each date is either a Milk-Bone Flavor Snacks mini dog biscuit or a holiday-themed biscuit.