If the person is at 29, and planning on staying there, prowl isn't gonna help. Lowest level req is 30. But yes, prowl+shadowmeld is nice.
Boars are nice for PvP, but I'd say wind serpents are good too, b/c even if they're rooted they can DD. Ravagers are good because of their uber DPS, and if you're BM and have BS then their speed isn't as big of an issue. Or you could go with a wolf for furious howl (if you stick with your group and have all hunters/melee guys this could deal a TON of damage).
So...cat (at 30+), wolf, wind serpent, boar, ravager, or really whatever you want. Go to petopia, it's got stuff there to tell you what species have special abilities.
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