|Tamed Mother Fang at the Mine Entrance|
Mother Fang can be found with NPCScan, but it isn't really necessary as she doesn't move from the location that she spawns at. If you do choose to add it, her NPCScan ID is 471.
Before the Cataclysm her spawn timer was somewhere between 1-2 hours. I believe it has since been reduced to somewhere in the 30min range.