Formally known as ZoneLevelPetExperience, now renamed to ShadowExperience is a whole new bar. This will now display and move according to your pets current experience. You can now also show % of experience, and current level of pet on the bar. You may also now color the bar according to your pets happiness. Coloring it to your pets happiness will remove the happiness icon.
Colors
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Green - Happy
Yellow - Okay
Red - Mad
Slash Commands:
/spe happy - Colors the bar by your pets happiness.
/spe petlevel - Puts your pets level on the right hand side of the bar.
/spe percent - Puts your pets current % of its level on the bar.
/spe lock - locks the bar or unlocks the bar.
Bugs
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*Color bar by happiness does not work.
Upcoming changes and additions:
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*Putting a black backdrop on the addon.

Change Log:Friday, December 11th, 2009
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*Got the addon back up and running.
*Got a backdrop so the bar is no longer clear.
Future Change:
Get color bar by pet happiness working again.
Thursday October 29th 2009
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*Think I might have got a fix finally on scaling bug.
Thursday October 22 2009
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*Scaling should now work correctly.
*Window should no longer overlap other windows.
Saturday October 17th, 2009
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*You can now scale the bar. 0.1-1.
*The default game icon for pets happiness will no longer be removed
from view if you have color by pets happiness turned on.
*Added a message for the /spe lock command so you know if you
are unlocking or locking the bar.
Thursday, October 8th, 2009
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*Added a tooltip that will now display the following:
Name, Level(If not shown on bar), % of current level(If not shown on bar), Type of pet, Current happiness, and how much more needed for pet to level.
*Added a function that when you click on the frame, it will now report its current status. Wiether its Content, Happy, or Feed Me!
Content - Perfect 150% damage, Happy - Okay, 100% damage, Feed Me - You better feed him or hes gonna get angry!
Thursday, October 1st, 2009
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*Renamed to ShadowExperience.
*Recreated the bar so now it will fill in as your pet gain's experience.
*Will now color itself based on pets happiness if you choose to.
*Can now show % of its level on the bar.
*Can now show level of the pet on the bar.
*Now lockable.
Friday, August 21st, 2009
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*Pet bar will now hide when pet is dismissed. -- Requested by lewal
Thursday, August 20th, 2009
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*Release