That's right Dungeoness...If you create a Macro -  
  
/macro SCN "target_custom_next bone" 
  
Then you will have a button on your power bar that will only target objects with Bone in the name, like "Bone Daddy". 
  
Or you could do it as a bind, and have a keyboard button that will do it 
  
/bind G "target_custom_next wolf" and everytime you press G, it will only target objects with Wolf in the name, like a "Nightwolf" 
 
  
Ohh that is excellent information, thank you.