A dog's head, i.e. a vile and contemptible creature, as a dog was. See Deuteronomy 23:18 1 Samuel 24:14 2 Samuel 9:8, 2 Samuel 16:9 Job 30:1 Ecclesiastes 9:4. And a dog's head is put for a dog by a synecdoche, usual both in the Hebrew and in other languages, as the head is oft put for the whole man in the Latin tongue. Which against Judah; so the particle lamed is well rendered, as el, which among the Hebrews is confessedly of the same nature and use, is used Ecclesiastes 9:14 Jeremiah 34:7 Ezekiel 13:9,20 Am 7:15. Have not delivered thee into the hand of David, which I could oft and easily have done. That thou chargest me to-day with a fault concerning this woman; either, that thou accusest me falsely concerning this matter; or, that thou canst not wink at so small a fault (for so he esteemed it) as conversation with this woman, who, whatsoever she formerly was, is now so impotent and inconsiderable, that she can do thee no service, as I have done.
Related Commentaries of 2 Samuel 3:8
2 Samuel 3:8
8 Then was Abner very wroth for the words of Ishbosheth, and said, Am I a dog's head, which against Judah do shew kindness this day unto the house of Saul thy father, to his brethren, and to his friends, and have not delivered thee into the hand of David, that thou chargest me to day with a fault concerning this woman?