Bone

Bones are items.

Natural generation
Bones can be found in chests hidden in desert temples and jungle temples in stacks of 4 to 6.

Mobs
Skeletons and Wither Skeletons may drop 0–2 bones upon death.

Fishing
Bones can also be obtained by fishing as part of the junk category. The best chance of catching a bone is achieved without the Lure or Luck of the Sea enchantments, yielding a 1.2% chance.

Usage
Using a bone on a wild wolf has a 1/3 chance of taming it. Bones cannot tame an angry wolf or a wolf that someone else has already tamed.

Trivia

 * As with Sticks and Blaze Rods, Bones are wielded as a tool instead of an item.
 * The bone appears to be the femur, the humerus, or the tibia of a human, however is more likely to be the femur, because the humerus and tibia are slightly curved (although there are no curves in Minecraft).