CleverPet

This simple AddOn shows a big text on the screen informing that your pet/minion has lost his target.
This info lasts for 5 seconds by default. When your pet/minion will find a new target, text will dissapear.
You can change text color and duration in the config inside CleverPet.lua

This AddOn might work on older on newer versions of WoW. Tested on 3.3.5a