The cat's armor class is 8+ its dexterity modifier.

 Add +2 to the cat's dexterity score

The cat has darkvision (60 ft.), as well as an advantage on Wisdom (perception) checks that rely on smell.

The cat will not willingly interact with water, but its owner may make a DC 15 charisma check. On a success, the cat is persuaded to enter the water.

As an action the cat can make a melee attack with it's claws.

Claws.+ prof. bonus to hit, 5 ft. reach, 1+ strength modifier (minimum of 1) slashing damage.

The cat gains 4 hit points and a 1d4 hit dice. It gains 1d4 hit points and another 1d4 hit dice for every other level (it's owner gains).In addition, it can pick 2 skills from the following- perception, survival, and stealth.

The cat gains 1 of the traits below, and 1 more with every other level (it's owner gains).

The cat can take 2 actions on any turn it chooses. It must rest before using this skill again. Additionally, any opportunity attacks made against the cat have a disadvantage.

As a bonus action, the cat can hide. It must rest before using this trait again. Additionally, the cat has resistance to any damage that comes from falling.

As an action, the cat can make a charisma check with a Dc equal to their target's passive wisdom (perception) score. On a success, the target is charmed and must spend their turn petting the cat. The cat must rest before using this trait again.

As a bonus action, the cat can take the help action to assist their owner, from as far away as 15 ft. The cat must rest before using this trait again.

As a bonus action, the cat rubs it's cheek against it's owner and makes a wisdom (medicine) check with a Dc of 10. On a success, their owner regains 1 lost hit point. The cat must rest before using this trait, and it has no effect if the owner is unconscious.