Keen Smell. The panther has advantage on Wisdom (Perception) checks that rely on smell.
Pounce. If the panther moves at least 20 feet straight toward a creature then hits it with a claw attack on the same turn, that target must succeed on a DC 12 Strength saving throw or be knocked prone. If the target is prone, the panther can make one bite attack against it as a bonus action.
Ranger Companion. +2 (rangers Prof bonus) to attack rolls and damage rolls, skills, saves and AC
Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 1d6+2 piercing damage.
Claw. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 1d4+2 slashing damage.