Arctic Stink Squirrel

Keen Hearing and Smell. The weasel has advantage on Wisdom (Perception) checks that rely on hearing or smell.

Innate Spellcasting. The arctic stink squirrel's innate spellcasting ability is Wisdom (spell save DC 11). The  can innately cast stinking cloud once per day. The arctic stink squirrel is immune to the effects of spells that it casts, but not to the effects of this spell cast by another source.

Familiar Behavior. Your familiar acts independently of you, but it always obeys your commands. In combat, it rolls its own initiative and acts on its own turn. A familiar can't attack but it can take other actions as normal.
When the familiar drops to 0 hit points, it disappears, leaving behind no physical form. It reappears after you cast find familiar again.

Familiar Telepathy. While your familiar is within 100 feet of you, you can communicate with it telepathically. Additionally, as an action, you can see through your familiar's eyes and hear what it hears until the start of your next turn, gaining the benefits of any Special Senses that the familiar has. During this time, you are deaf and blind with regard to your own Senses.

Familiar Pocket Dimension. As an action, you can temporarily dismiss your familiar. It disappears into a pocket dimension where it awaits your summons. Alternatively, you can dismiss it forever. As an action while it is temporarily dismissed, you can cause it to reappear in any unoccupied space within 30 feet of you.

Familiar Spellcasting. When you cast a spell with a range of touch, your familiar can deliver the spell as if it had cast the spell. Your familiar must be within 100 feet of you, and it must use its reaction to deliver the spell when you cast it. If the spell requires an attack roll, you use your attack modifier for the roll.

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