I'm not sure if a pet does everything a human can do, but it can: fly (certain ones), distinguish mimics from chests (certain ones), let you and people that you accept gather materials such as herbs from it (certain ones), and pets can only have certain skills. I'm not sure if they can learn new ones such as counter attack though.
Pets can revive you ONLY when you equip them with feathers that are for pets-use only. They can usually be purchased at the healers. I THINK that you need to say a command through the ALL channel to your pet, but I'm not sure on that either.
There is not a skill that you can use to revive others without using a feather.
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Yes. It's off. Another new one is in progress.
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