As of Pocket Edition 0.3.0, cows have been part of Minecraft Pocket Edition. If you have that version or above, then there should be cows.
Sheep, Chickens, Cows, Pigs, Skeletons, Zombies, and Spiders.
No, Its only for Xbox and PC Currently the only mobs available are Sheep, Chickens, Cows, Pigs, and Zombies.
To get cows to follow you in Minecraft PE you need to have wheat in your hand.
Grass
Cows fall from minecraft!
Leather is harvested by killing cows.
In order to spawn mobs or animals in minecraft pe you need to buy the app Minecraft Pocket edition Invpro. For $1.50 you can spawn mobs, change your game from creative to survival, hack in LAVA and WATER BLOCKS, and much more! P.S. Don't spawn over 100 mobs. It will glitch your game. By: THE MINECRAFT MASTER
Cows mostly spawn in the Snowy Biomes, so what seed you have shouldn't matter.
Likely not.
The most common creature in minecraft are cows, pig, chickens and shepp. But it also depends on the seed
Because unfortunately that's the way they were programed.