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

Pounce. If Guenhwyvar moves at least 20 feet straight toward a creature and then hits it with a claw attack on the same turn, that target must succeed on a DC 14 Strength saving throw or be knocked prone. If the target is prone, Guenhwyvar can make one bite attack against it as a bonus action.

Pack Tactics. Guenhwyvar has advantage on an attack roll against a creature if at least one of her allies is within 5 ft. of the creature and the ally isn't incapacitated.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 10 (1d10 + 5) piercing damage.

Claw. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) slashing damage.