Your pet?s growl can be extremely useful against shaman. Grounding totem will absorb one harmful magical effect that would?ve been cast on the shaman (or reflect if glyphed). What this means for you is that if the shaman has a grounding totem down and you go to scatter trap him the grounding totem will eat the trap for him and you will not trap him. If you see a shaman with the grounding totem buff, you can use your pet?s growl on him and it will absorb the grounding totem effect, allowing you to trap him (or someone else on your team to get a harmful magic effect through).