How to find this werewolf effect?

If you have the new S4S then you can get a list of all the game fx from the Tool-> Generate List-> VFX menu. Next, you can either copy and paste everything from that window into a text editor so it can be easily searchable or just scroll through the list. The werewolf pack is GP12. Next, you'll need the Studio Effect Player by andrew from here. Put everything in that zip in your mods folder. Go into your game, into an occupied lot (you have to be able to go into live mode to see the VFX play) place the player down and start testing the VFX from the list to find the one you are looking for. Hope this helps.