Game Mechanics: Mage Pets doing 50% damage in PVP.

[Zippit]

Not to bump an old post, but after testing to obtain a max pet via /duel to another player, a Zumaiks pet hitting for Max (Sitting) @ 45 damage on a player, indeed hit for 56 damage on an NPC. Which would tell me the reduction is roughly 20% rounded down. Hope that helps.