you heal it by getting porkchop and left clicking on it. you should see its tail go up if successful
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The only way you can disown a wolf is to kill it.
wolf collars cannot be dyed
No.
There is no way to heal it unless you have a Splash Potion of Healing/Regeneration. Although there is a rumor that you can heal it by feeding it fish after you tame it.
Not in the current Vanilla (Minecraft without Mods) Minecraft, no. But their are a few Mods out there that will make that possible.