Honestly, it SHOULD work fine with Rage (when you're in Bear form), Energy in kitty form, and Mana in Caster/Tree/Boomkin forms - they're all referenced, generally, by "MP" codes in DogTags.
If you're looking for Druid Mana while in non-caster forms, I believe it's referenced as DruidMP or DruidMana.
Honestly, there's a comprehensive in-game help for DogTags, just type /dogtag. It's searchable, in alphabetical order, broken up by easy categories, and includes full usage info on every command.
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-- Taryble
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