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Cow
Cow store content 1
A Sim milking a cow.

Cows are a type of NPC animal found in The Sims 2 for Nintendo DS, GBA and PSP, the "Farm Fresh Folk Set" on The Sims 3 Store and The Sims 4: Cottage Living. Cows seem to be a recurring theme in The Sims series.

The Sims 2 (Nintendo DS)

Cow

Cows made their first debut in The Sims 2 for Nintendo DS. They are found in the field outside of Strangetown, near Jebidiah S. Jerky's home. They can be interacted with in three ways: players can either milk them, tip them over or give them a gift. Only chocolate seems to have an effect.

After the Sim has tipped the cow over, it will simply come back up. If a cow is milked after it has been tipped over it will produce a milkshake instead of a glass of milk. However, if the cow has been given chocolate it will produce chocolate milk, or chocolate milkshake (if it has been tipped over before). This feature is not profitable nor more effective in filling the need bar.

In the field, there's also a red colored bull. No interactions are allowed with this animal.

The Sims 2 (GBA)

Cows also appear in The Sims 2 for Game Boy Advance, but cannot be interacted with. They appear in the Cattle Cleanup minigame along with a red colored bull. Lore-wise, this is also Jebediah's farm.

The Sims 2 (PSP)

They also make an appearance in The Sims 2 for PlayStation Portable, but they are not interactable either. There are two cows inside the "Kine Dairy" building in Deadtree, place of worship of the Kine Society towards Beelzebeef, a god with the appearance of an enormous cow.

The Sims 3 Store

Milkin' It Dairy Corral
Milkin' It Dairy Corral
The Milkin' It Dairy Corral lets you milk cows until the cows come home..err..never mind. These aren't just normal cows though - they can give you several different flavors of milk, and if you're lucky, milkshakes! Be careful though, these cows are smart and competitive. They have no mercy when playing an intense game of Tic-Tac-Hoof, and they don't like to be tipped over!
Game The Sims 3 Store
Buyability Buy mode
Price in game §2,300
Object type(s) Hunger
Moodlet
Logic
Simology
Size 11x12

Cows returned to The Sims 3 in the "Milkin' It Dairy Corral" premium content included in the "Farm Fresh Folk Set" from The Sims 3 Store. In Buy Mode, it is located in "Decor" → "Sculptures", as opposed to in the "Pet Essentials" section.

SimGuruTaterTot shared some information (dead link) about what the cow barn can do:

Interactions

The Sims 4: Cottage Living

Gallery

Trivia