These rhetorical questions can be translated as statements. When David asks the questions, he knows that he will answer the questions himself. AT: "Let me tell you who the king of Israel has come out after. Let me tell you who it is that you are pursuing." (See: [[rc://en/ta/man/translate/figs-rquestion]])
The words "dead dog" are a metaphor for a powerless person. This sentence can be made complete. AT: "You are pursuing a person who is as powerless as a dead dog" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-ellipsis]])
The word "flea" is a metaphor for a person whom others do not consider important. AT: "You are pursuing a person who is as unimportant as a flea" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-ellipsis]])