Hunter's pets haven't changed much since Classic World of Warcraft, but they've gotten stronger by scaling with the owner, thus the more powerful a player becomes, the more benefits the pet gains. Hunter's pets now have some new skills, including avoidance, which reduces the amount of passive AOE damage they take in combat. The random deaths of hunter pets during a boos fight, resulting in a significant DPS loss, was one of the most vexing aspects of the classic game.
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In my experience, the best hunter pet for WoW TBC Classic Arena really depends on your playstyle and team composition. However, one of the top choices for many hunters is the Ravager. Its ability to interrupt spellcasting with its "Gore" ability can be a game-changer in Arena matches, disrupting enemy healers and casters.That said, it's important to consider your team's needs and your personal preferences. A pet like the Scorpion with its crowd control abilities or a Spirit Beast for its healing can also be valuable options depending on your strategy.
Ultimately, the best hunter petin Arena is the one that complements your gameplay style and helps your team achieve victory. Experiment with different pets to find the one that suits you and your team the best. Good luck out there in the Arena