David stands before Saul, delivering a powerful moral and logical argument that exposes the sheer absurdity of the king's relentless manhunt. He challenges the dignity of the pursuit, questioning why the sovereign ruler of Israel would personally lead an expedition to capture a common, lowly citizen instead of simply dispatching messengers to do the job. The primary approach among commentators is that David is highlighting how this obsessive chase ultimately damages the king’s own honor [מצודת דוד, רד״ק].
To drive home his utter insignificance relative to the crown, David paints two extreme pictures of himself. He first compares his current state to a lifeless dog, a symbol of absolute weakness and nothingness. He then likens himself to a single flea, a tiny insect that merely bites and frantically jumps from place to place [מצודת ציון, רד״ק, ביאור שטיינזלץ]. Just as there is no glory or heroism for a man who hunts down a flea hidden in his clothing, there is no honor for Saul in hunting down David [רד״ק].
The description of the campaign reflects different stages of the conflict [מלבי״ם]. At the onset of the rift, David is likened to the dog. He was once a fiercely loyal guard dog to his royal master, but once Saul rejected him, he was rendered as useless as a dead hound. As the campaign evolved into an active, ongoing chase, David became like the flea. Even though he is accompanied by six hundred men, his actual power is fragile. He is nothing more than a solitary flea, constantly leaping from one hiding spot to another just to evade capture [מלבי״ם].
A distinctly different perspective suggests that these vivid images do not all refer to David himself. In this view, the lifeless dog is actually a pointed reference to the informants from Ziph. These men acted like eager hunting dogs, catching a scent and dragging their master along on the trail. They are described as dead because the wicked are often referred to as such, and because the intelligence they provided ultimately proved useless. David is sharply rebuking Saul for mindlessly allowing himself to be led by such people. The image of the flea, however, is used to highlight David's remarkable self-restraint. While a literal flea is entirely incapable of killing the man hunting it, David had the perfect opportunity to strike down Saul. Instead, he chose to hold back, leaving ultimate judgment in the hands of God [אלשיך].