Adult Fox

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

Pounce. If the fox moves at least 20 ft. straight toward a creature and then it hits it with a claw attack on the same turn, that target must succeed on a DC 13 Strength saving throw or be knocked prone. If the target is already prone, then the fox can make one bite attack against it as a bonus action.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d8 + 5) piercing damage. 

Claw. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 5) slashing damage.

Elude. Adds 2 to its AC against one opportunity attack that would hit it.