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Utility Abilities
(Pets with a - E are exotic pets tameable only by Beast Mastery Hunters)
Bloodlust / Heroism
Ancient Hysteria (Core Hound - E) - Increases melee, ranged, and spell casting speed by 30% for all party and raid members. Lasts 40 sec.
Allies receiving this effect will become Sated and be unable to benefit from Bloodlust or Time Warp again for 10 min. / Instant, 6 min cooldown
Healing
Spirit Mend (Spirit Beast - E) - The Spirit Beast heals the currently friendly target for {1237.75+((RAP*0.35)*0.5)} plus an additional {475.97+((RAP*0.35)*0.335)} over 10 sec. / 25 yd range, Instant, 40 sec cooldown
Stamina Buff
Qiraji Fortitude (Silithid - E) - Increases party and raid members' Stamina by 584.76. / Instant
Critical Strike Buff
Furious Howl (Wolf / Dog) - The wolf lets out a furious howl, increasing the critical strike chance of all party and raid members by 5%. / Instant, 45 sec cooldown
Terrifying Roar (Devilsaur - E) - The devilsaur lets out a terrifying roar, increasing the critical strike chance of all party and raid members by 5%. / Instant, 45 sec cooldown
Casting Speed Reduction
Lava Breath (Core Hound - E) - Your pet breathes a double gout of molten lava at the target, reducing the target's casting speed by 25% for 10 sec. / 30 yd range, Instant, 8 sec cooldown (No longer deals damage)
Spore Cloud (Sporebat) - Dusts nearby enemies with spores, reducing all enemy targets within 6 yards casting speed by 25% for 9 sec. / 6 yd range, Instant, 12 sec cooldown
Attack Speed Reduction
Dust Cloud (Tallstrider) - Your tallstrider kicks up an obscuring cloud of dust, causing all enemies within 10 yards to have their melee and ranged attack speed reduced by 20% for 8 sec. / 5 yd range, Instant, 40 sec cooldown
Movement Speed Reduction
Ankle Crack (Crocolisk) - Snap at the target's feet, reducing movement speed by 50% for 6 sec. / 5 yd range, Instant, 10 sec cooldown (Replaces Bad Attitude)
Frost Breath (Chimaera - E) - Your pet simultaneously breathes frost and lightning at an enemy target, slowing the target for 5 sec. / 30 yd range, Instant, 10 sec cooldown (No longer deals damage)
Time Warp (Warp Stalker) - Slows time around the enemy, reducing their movement speed by 50% for 6 sec. / 25 yd range, Instant, 15 sec cooldown
Healing Debuff
Monstrous Bite (Devilsaur - E) - Your devilsaur ferociously bites the enemy, reducing the effectiveness of any healing received by 25% for 8 sec. / 5 yd range, Instant, 8 sec cooldown
Root
Venom Web Spray (Silithid - E) - Sprays toxic webs at the target, preventing movement for 5 sec. / 30 yd range, Instant, 40 sec cooldown (Up from 4 sec, no longer deals damage)
Web (Spider) - Encases the target in sticky webs, preventing movement for 5 sec. / 30 yd range, Instant, 40 sec cooldown
Silence / Interrupt
Serenity Dust (Moth) - The moth's wings produce a cloud of dust that interrupts the enemies spellcasting and preventing any spell in that school from being cast for 2 sec. / 25 yd range, Instant, 1 min cooldown
Armor Reduction (Sunder Armor)
Tear Armor (Raptor) - Tears at the enemies armor with the raptor's talons, reducing it by 4%. Stacks up to 5 times. Lasts 30 sec. / 5 yd range, Instant, 6 sec cooldown
Corrosive Spit (Serpent) - Spits poison at an enemy, corroding their armor, reducing it by 4%. Stacks up to 5 times. Lasts 30 sec. / 30 yd range, Instant, 6 sec cooldown
Increased Bleed Damage
Gore (Boar) - Your boar gores the enemy, causing it to take 30% additional damage from bleed effects for 15 sec. / 5 yd range, Instant, 10 sec cooldown
Tendon Rip (Hyena) - Tears at an enemy's legs, increasing damage taken from bleed effects by 30% for 15 sec. / 5 yd range, Instant, 10 sec cooldown
Increased Magic Damage
Fire Breath (Dragonhawk) - Breathes Fire on the target, increasing magic damage taken by 8% for 45 sec. / 40 yd range, Channeled, 30 sec cooldown
Lightning Breath (Wind Serpent) - Breathes lightning, increasing magic damage taken by 8% for 45 sec. / 40 yd range, Channeled, 30 sec cooldown
Increased Physical Damage
Acid Spit (Worm - E) - Your worm spits acid, causing the enemy target to take an increased 4% physical damage for 25 sec. / 20 Focus, 30 yd range, Instant, 10 sec cooldown
Ravage (Ravager) - Violently attacks an enemy, causing the enemy target to take 4% increased physical damage for 25 sec. / 5 yd range, Instant, 15 sec cooldown
Stun
Sonic Blast - Emits a piercing shriek, stunning the target for 2 sec. / 20 yd range, Instant, 1 min cooldown (No longer deals damage)
Sting (Wasp) - Your wasp stings the target, stunning them for 2 sec. / 5 yd range, Instant, 45 sec cooldown
Physical Damage Reduction
Demoralizing Roar (Bear) - The bear roars, reducing the physical damage caused by all enemies within yards by 10% for 15 sec. / 5 yd range, Instant, 10 sec cooldown
Disarm
Clench (Scorpid) - The scorpid clenches the enemy's weapon with its talons, and disarming their main hand and ranged weapons for 10 sec. / 5 yd range, Instant, 1 min cooldown
DPS Abilities
Bite - Bite the enemy, causing {187.74+((RAP*0.35)*0.40)} damage. / 25 Focus, 5 yd range, Instant, 3 sec cooldown
Claw - Claw the enemy, causing {187.74+((RAP*0.35)*0.40)} damage. / 25 Focus, 5 yd range, Instant, 3 sec cooldown
Smack - Smack the enemy, causing {187.74+((RAP*0.35)*0.40)} damage. / 25 Focus, 5 yd range, Instant, 3 sec cooldown
This is the full list posted at MMO. I can definitely see how some of the non-exotic pets would be worth having in the stables, just in case.
Example? If you have a Rogue in your raid, but no Arms Warrior or Feral Druid. Hell, even if you have a Kitty around, it might still be worth taking a Hyena (assuming it is a ferocity pet), since Mangle is a dps loss for the Druid if they don't need to put up the buff.