Here's what I've gotten. Now my gear set-up is poor for bm, but it is the only way I can test every pet species.
Hunter Spec I used. My hunter is in my sig.
NO RAID BUFFS
[overall dps] [pet dps] -species
Ferocity
[3391.79] [1064.59] -Wolf
[3255.79] [983.75] -Carrion Bird
[3269.58] [997.54] -Cat
[3250.01] [977.97] -Hyena
[3250.01] [977.97] -Moth (I don't think the moth ability is applied correctly)
[3293.74] [1021.70] -Raptor
[3232.40] [960.36] -Tallstrider
[3336.58] [1027.76] -Wasp
[3305.94] [1033.90] -Core Hound
[3341.14] [1069.10] -Devilsaur
[3303.44] [1031.40] -Spirit Beast
Cunning
[3186.38] [922.61] -Chimera
[3146.68] [882.91] -Silithid
[3162.41] [898.64] -Bat
[3160.72] [896.95] -Bird of Prey
[3152.68] [888.91] -Dragonhawk
[3151.73] [887.96] -Nether Ray
[3149.16] [885.39] -Ravager
[3131.86] [868.09] -Serpent (I suspect this is broken because serpents actually have a high damage output)
[3151.42] [887.65] -Spider (broken for sure, the spider skill does nothing for dps and should decline actually because of focus usage)
[3156.32] [870.75] -Spore Bat (more effective in mobs)
[3163.91] [900.14] -Wind Serpent
Tenacity
[3127.45] [868.32] -Bear
[3151.93] [888.16] -Boar
[3138.97] [875.20] -Crab (possibly broken)
[3138.97] [875.20] -Crocolisk (does more dps when hit)
[3123.27] [859.50] -Gorilla (does more dps with ability off)
[3135.80] [872.03] -Scorpid
[3138.97] [875.20] -Turtle (broken)
[3111.33] [847.56] -Warpstalker (warp doesn't calculate right)
[3151.63] [887.86] -Rhino
[3392.31] [976.76] -Worm (correct, srsly)
According to this, if my hunter was bm, I should go with a Worm or Wolf.