A tamed wolf can attack a happy ghast when we hit it, this happens when the wolf is riding a boat that is hanging on the happy ghast.
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Hi!
Thank you for your report!
We're already tracking this issue at MCPE-229897 , so I will resolve and link this ticket as a Duplicate.
I suggest also to browse through the main issue for potential fixes.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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Tamed wolves have always attacked any mob that you hit. I believe this is intended behavior.