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TL;DR: build 70450 (Nov 9) cut all three standout pet abilities - Dismember, Sonic Blast and Mine! - roughly halving their strength and doubling cooldowns. A day later, the pet-health bug fix dropped effective HP from 150% to 115%. Pets are still strong; they're just no longer doing other classes' jobs in PvP.

November 9 - ability nerfs (build 70450)

Ability (pet)BeforeAfter
Dismember (Crocolisk) - healing reduction50% for 10 sec, 6 sec cooldown25% for 6 sec, 15 sec cooldown
Sonic Blast (Bat) - cast slow60% for 30 sec, 30 sec cooldown30% for 20 sec, 60 sec cooldown
Mine! (Monkey) - disarm4 sec, 60 sec cooldown3 sec, 90 sec cooldown

Wowhead's read: the abilities were too close to Warrior/Warlock-style utility, and hunters were stacking too much control on top of pet damage - especially in PvP.

November 10 - the "health nerf" that was a bug fix

150% → 115% health

Pets were running at 150% of intended health due to a bug. The fix set them to 115% - players read it as a nerf because it's a big drop from what they were used to.

Partial compensation

Arcane Shot and Summon Hawk dropped to 11% base mana at every rank, and the Hawk's melee damage went up ~80%.

Warlock demons up

Same patch raised Imp, Voidwalker, Succubus and Incubus base health ~15%, and the Imp's first four Firebolt ranks hit harder.

Pet choice impact: Crocolisk and Bat lose their niche as budget Mortal Strike / Curse of Tongues. For leveling and farming, family damage and survivability barely moved - the nerfs mainly matter if you PvP or relied on Dismember for elite killing.

FAQ

What hunter pet abilities were nerfed in WoW Forever?

Dismember (Crocolisk healing reduction), Sonic Blast (Bat cast slow) and Mine! (Monkey disarm) - all on November 9, plus a pet-health bug fix on November 10.

Is Dismember still worth using?

At 25% for 6 seconds it's a light debuff, not a healer-killer. Still fine to keep, but don't pick a Crocolisk for it alone.

Why did Blizzard nerf hunter pets?

Pet utility overlapped too heavily with other classes' signature tools, letting hunters dominate PvP exchanges. Blizzard said the abilities stay strong, just not class-replacing.

Did hunters get anything back?

Yes - cheaper Arcane Shot and Summon Hawk (11% base mana all ranks) and ~80% more Hawk melee damage in the Nov 10 class pass.