You have two cows: Gundam edition
0079: You have two cows.  One produces milk three times faster but is miffed that the other cow shares an innate spiritual connection with the farmer’s daughter.
Zeta: You have two cows, and they spend all day taking shots at each other for the best grazing territory only to be blind-sided by a third cow.
ZZ: You have two cows and everyone thinks they’re so cute and funny, but things get deadly serious after one falls over.
Char’s Counterattack: You have the same two cows from 0079, and the fast one is still salty about what happened and tries to knock the barn down.
0080: You have two cows.  One becomes hamburger.
0083: You have two COWS OF DESTINY.
F91: You were supposed to have two cows for a year, but after a lot of arguing with the salesman and the farmhands, you only have them for two hours and nobody is happy.
Victory: You have two calves.  Their parents are dead.
G: You have two cows, one of which is actually a cyborg replica of a cow and the second is on fire with the help of the first.
Wing: You have two male cows and cannot figure out why 90s kids are so intent on pairing them.
X: You have two cows who are most active when the moon is full.
08th MS Team: You have two cows separated by a fence, and one sacrifices a leg to be with the other.
Turn A: You dig up two cows and produce milk and butter the old fashioned way because you don’t have any machinery to do it for you.
SEED: You have two cows that were genetically engineered to be superior to all other cows.  Your neighbor is miffed because he’s stuck with thirty clones of the same cow.
SEED DESTINY: You have two cows that you sell because you decided the SEED cows were actually better.
00: You have two cows, and are understandably perturbed when one starts talking to you while covered in crystals.
Unicorn: You have two cows, but your tenuous grip on power relies on them never seeing what’s inside the barn.
AGE: You have successive generations of cows, none of which develop to your liking.
Build Fighters: You have two cows.  One is incredibly smart but physically weak, while the other is strong and dumb.  Together, they win a blue ribbon at the county fair.
Reconguista: You have two cows.  They begrudgingly get along even though they keep munching on each others’ grass.