Keen Smell. The smilodon has advantage on Wisdom (Perception) checks that rely on smell.

Pounce. If the smilodon moves at least 20 feet straight toward a creature of medium size or smaller and then hits it with a claw attack on the same turn, that target must succeed on a DC 16 Strength saving throw or be knocked prone. If the target is prone, the smilodon can make one bite attack against it as a bonus action.

Multiattack. The smilodon makes three attacks: one with its bite and two with its claws. If the target is prone, the dire smilodon can make one bite attack against its target as a bonus action.

Bite. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 10 (9d8 + 12) piercing damage.

Claw. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 12 (5d8 + 8) slashing damage.