This activity can be acquired from Tanner Brada, who can be found in the Talmberg village south west of the castle. He is in need of animal hides of various sorts, and would like you to provide them. The easiest way to complete this activity is by visiting other tanners in the realm and purchasing the hides directly from them. If you would rather hunt for the hides, the nearest boar hunting spot can be seen on the map below.
The next batch that Tanner Brada requires are hare hides. If you would rather hunt than buy them, hare can easily be found throughout the woods surrounding Talmberg. Once you have handed them in you will receive the final objective; roe deer hides. Roe deer can be tricky to hunt, so purchasing them from a tanner is advisable. However, if you prefer to hunt them they can be found most reliably from the deer hunting spot shown on the map below.
With the deerskin handed in, the activity completes.