My story returns back to ~Beta 1.5, on the update that added wolves to the game.
I was swimming on a newly-created world, playing on Peaceful, when I confronted this new, weird looking, grey mob. Naturally, I hit it to listen to the newcomer's moans, only to see its siblings turn into bloody rampaging red eyes and pounce at me madly. After I died, I simply ragequitted upon Mojang and went to the wiki, only to discover this new cute mob called "Wolf".
Yeah.