1 Samuel 24:14

24:14 Who has the king of Israel come out after? Who is it that you are pursuing? A dead dog? A single flea?

1 Samuel 17:43

17:43 The Philistine said to David, “Am I a dog, that you are coming after me with sticks?” ¹  Then the Philistine cursed David by his gods.

[17:43]  ¹ sn Sticks is a pejorative reference to David’s staff (v. 40); the same Hebrew word (מַקֵּל, maqqel) is used for both.