Bukkit

Each mob has different items that you can put inside the inventory to change that mob's attributes. You can do this by right clicking with a bone while having EMA enabled. All of these mobs are listed here:

Chicken/Cow:

• RedStone = Baby
  
• Glowstone = Agelock

Creeper:

• RedStone = Powered

Horse:

• RedStone = Baby
  
• Glowstone = AgeLock
  
• HayBale = Tamed
  
• Player head attached with a player's name = Tamer

Pig:

• RedStone = Baby
  
• Glowstone = AgeLock
  
• Saddle = Saddled

PigZombieCache:

• You can right click or use the first 5 slots of the inventory to add armor and held item.
  
• Redstone = Baby

Sheep:

• Redstone = Baby
  
• Glowstone = AgeLock
  
• Shears = Sheared

Skeleton:

• You can right click or use the first 5 slots of the inventory to add armor and held item.

Zombie:

• You can right click or use the first 5 slots of the inventory to add armor and held item.
  
• Redstone = Baby

More Options will come as this plugin develops.