When you have a pet out ( hunter/lock/dk ), you can control the spy hunter wolf using pet attack and pet follow. You must have an enemy targeted.
This most likely works with other temporary pets, but I cannot confirm yet.
I wasn't going to post this untill I saw the other spy hunter thread where it was noted that the discovery of spys is based on time.
So you can use this to stand in one spot and wait out the time untill the wolf is ready to find a spy.
Or you can use it with other temp pets to attack enemy players.