Fast Zombie Dire Tiger
They can see well in full darkness, and, as all undead, are immune to charms, compulsions, morale effects, patterns, phantasms, death effects, disease, paralysis, poison, sleep effects, and stunning. Not subject to nonlethal damage, ability drain, or energy drain. Immune to damage to its physical ability scores (Constitution, Dexterity, and Strength), as well as to exhaustion and fatigue effects. Immunity to any effect that requires a Fortitude save (unless the effect also works on objects or is harmless). Not at risk of death from massive damage, but is immediately destroyed when reduced to 0 hit points. Undead do not breathe, eat, or sleep.
while most zombies are slow, there are some variants that are extremely fast. Whimever created these dire tiger zombies was extremely malicious.