Homebrew
Keen Smell. The cat has advantage on Wisdom (Perception) checks that rely on smell.
Magic Resistance. The grinning cat has advantage on saving throws against spells and other magical effects.
Pack Tactics. The cat has advantage on an attack roll against a creature if at least one of the cat's allies is within 5' of the creature & the ally isn't incapacitated.
Claws. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 7 (2d4 + 2) slashing damage.
Bite. Melee Weapon Attack: +0 to hit, reach 5 ft., one target. Hit: 1 piercing damage.
Any climate, any terrain