Shepherd

"The LORD is my shepherd, I shall not want."
                     Psalm 23:1

We are very familiar with this beautiful Psalm. Our Father in heaven, and His Son, Jesus, are both referred to as shepherds. When we consider this, we have a very pastoral and gentle image of a kind shepherd gently tending to the everyday needs of his sheep. And so the Father does for us continuously. Scripture says of Him:

"He will feed His flock like a shepherd;
He will gather the lambs with His arm,
And carry them in His bosom,
And gently lead those who are with young."
                           Isa. 40:11

Another image of the shepherd is given in scripture. Jesus says of Himself in Jn 10:11, "I am the good shepherd: the good shepherd giveth His life for the sheep."
What Jesus reveals here is part of the special nature of the shepherd, that we sometimes overlook. A shepherd not only provides food and shelter for his sheep, but he also fends off predators of the flock, even at the risk of his own life.
David, before he became king of Israel, was a shepherd in his youth. He was very familiar with the duties of a shepherd, particularly when it came to protecting the flock of his father, Jesse. David recounts to Saul the occasion when he fought both a bear, and a lion that had taken one of the lambs of his father's flock. He not only killed the two predators, but rescued the lamb right out of their mouths (1 Sam 17:34-35). David had the experience in the LORD of himself and his lamb being delivered out of the mouths of fierce beasts.
We are told in scripture of another instance involving David, and his experience as a shepherd. He had been in the territory of Carmel, with his men, before he became king. While there, he came across the flocks and herds of a rich man named Nabal. As long as David was in the territory, Nabal's shepherds were protected, and all predators were kept from the flocks by day and night. Not one animal was lost, as long as the shepherds stayed with David and his men 
(1 Sam. 25:15-16).
In another instance, King David's anger was kindled as the prophet Nathan told him a tale of a poor man's only lamb being taken from him by a rich man. He even told the prophet that he would have this rich man killed for taking the lamb. Even though he was a king at this point in his life, David was moved in his shepherd's heart on behalf of this poor man and his lamb. He didn't immediately understand that the prophet was telling David about the king's own sin in taking another man's wife. When he did understand the point of the story, he was repentant for his actions (2 Sam. 12:1-5).
As for David's shepherd heart, willing to fight for his flock, the LORD said, "I have found David, the son of Jesse. a man after My own heart, who will do all My will." (Acts 13:22). David had the same heart as His heavenly Father - a shepherd's heart.
Dealing so closely with with predatory beasts, both natural and spiritual, can come at a heavy cost to shepherds. Our Father has called men and women to be the shepherds of His people, as well. Sometimes we forget the spiritual danger in being this kind of shepherd, a good shepherd. But it is these shepherds experiences  with the delivering power of God that allows them success against the enemies to the flocks of God, and brings great benefit to us.
As our Father is our Shepherd, and the Shepherd of Israel, He also has this same heart for His people, His sheep. Not only does He supply all of our needs, and direct our way, but He fiercely protects us against the spiritual predators that seek to harm us. As Jesus said, He was willing to die to keep our lives.
Our Father is our Shepherd.

"The LORD is My Shepherd"
http://www.youtube.com/watch?v=A-qLa_2GPcM

"Shepherd Me, O God"
http://www.youtube.com/watch?v=6g_hROZbQV8