Mage pet bug
 

I've observed that when I /assist on a pull, and send my pet before the mob.. it bugs my pet for that fight because it cannot be seen. Not only does the pet not attack, but it seems that my target bar shows the mob at a permanent 100% until it is killed.

what level pet is it mine are working fine

Update : If encounter this problem, just 'esc' to remove target, re-target and it's fixed.