Location
In Farron Keep, can be reached by turning right when coming down the Keep Ruins Bonfire ramp and searching for a ladder near a structure. It will have Rotten Slugs infront of it, as if they were guarding the ladder. If you went to the small housing of Rotten Slugs that contains an Undead Bone Shard, you're too far left from the ramp.
Usage
Leader of Watchdogs of Farron, it allows you to level up in this covenant by offering Wolf's Blood Swordgrass
Gives the player the Legion Etiquette gesture
Notes
It is reminiscent of great grey wolf Sif from the original Dark Souls.
Praying to the Old Wolf of Farron would be rendered impossible by Hawkwood the Deserter after the Abyss Watchers fight due to an unknown occurrence prior to patch 1.03.