The reindeer antler Snapchat filter was released in December 2018. Shortly after Christmas, the lens disappeared from the Snapchat app. There is, however, one way to get it back.
To get the reindeer antler Snapchat filter simply take a snap of this Snapcode below which will temporarily open up the Snapchat lens for you to use on your dog:
Here is the filter being used on our German Shepherd Dog, Aura: