The words against Judah are very obscure. If the text be correct, the words would seem to be Ish-bosheth’s, who in his anger had charged Abner with being a vile partisan of Judah: Abner retorts, “Am I (as you say) a dog’s head which belongeth to Judah, or on Judah’s side! This day I show you kindness, etc., and this day thou chargest me with a fault, etc.”
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?