Do You Need Xbox Live for Hellhounds in Black Ops 2 Zombies?

No. Hellhounds are standard enemy spawns in several Black Ops II Zombies maps (Mob of the Dead, Origins, Buried, Nuketown Zombies). They appear in Solo (Offline), Local Split-Screen, and Online modes identically.

Xbox Live Gold is required for:

• Online Co-op (Public Match, Custom Match with friends).
• Leaderboards & Stats tracking.
• Downloading DLC Maps (Uprising, Revolution, Vengeance, Apocalypse).
• Persistent unlocks (Weapon camos, calling cards) syncing.

If you play Solo or Local Split-Screen (no Gold needed on 360 for local), Hellhounds will spawn normally based on round progression and map mechanics.