'Dog's' in the Bible

Then was Abner very wroth for the words of Ishbosheth, and said, Am I a dog's head, I who against Judah do shew kindness this day to 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 reproachest me this day with the fault of this woman?

He that slaughtereth an ox, smiteth a man; he that sacrificeth a lamb, breaketh a dog's neck; he that offereth an oblation, it is as swine's blood; he that presenteth a memorial of incense, is as he that blesseth an idol. As they have chosen their own ways, and their soul delighteth in their abominations,