According to the all knowing sage that is Wikipedia, cows are a “large domesticated cloven-hooved herbivores.” Society has used them as a good source of beef and hide. They also fart and shit a lot.

Lets Looks at the numbers!

STR: 18 (+4): muscular moo

DEX: 10 (+0): moo

CON: 14 (+2): beefy moo

INT: 2 (-4): stupid moo

WIS: 10+0): sage moo

CHA: 4 (-3): MoOo

Moo moo has AC 10 so pretty easy to hit, and only 15(2d10+4) Hit Points, also easy enough to kill.

What makes them cool?

A Dungeons and Dragons cow is much like your everyday IRL cow: It likes to charge you and run you over, and also really likes to eat. With its CHARGE ability, if it moves towards its target and then hits it with its gore attack, it deals an additional 7(2d6) damage on top of the 7(1d6+4) damage. Funny enough, that’s more than enough to outright down or kill a young adventurer

Death by cow. Moo

Gore. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) piercing damage. Cows are actually surprisingly strong creatures that can really fuck up any low lever character.

What the hell do I do with a cow?

1. Need to throw a fun encounter at your player? When the players finally earn a little bit of downtime, have them enter a town that is having their annual “Running of the Bull.” Have the participating players make several dexterity checks or be trampled and gored (2d6 + 1d6 + 4). If they make it through in one piece, they should for sure get a little bit of gold and notoriety in the town.
2. Need a sidequest? Ol’ Cheeze Bean is out of the pen again. Make several animal handling checks to get her back into her pen without injury. Unfortunately, Ol’ Cheeze Bean is one ornery sun of a bitch.
3. Much like the first idea, the players encounter a stampede of cows running towards them. Dex saving throws to avoid the damage. What could possibly be spooking them? Up to you, but you can never go wrong with a hill giant or cyclops.