Wolves chase Skeletons and Sheep, but when one is in Creative, and then one hits the Wolf, their skin becomes the hostile version and they emit hostile noises.

I do not know whether it should turn hostile or should stay the same, but regardless, this still needs to be fixed (albeit not too soon, I do not doubt!).
Steps to reproduce:
1). Spawn a Wolf in Creative.
2). Spawn a Skeleton nearby.
3). Slap the Wolf when it chases the Skeleton.
4). It will change to hostile appearance, and emit hostile noises.