Albert Barnes Commentary Psalms 68:23

"That thou mayest crush [them], [dipping] thy foot in blood, That the tongue of thy dogs may have its portion from [thine] enemies." — Psalms 68:23 (ASV)

That thy foot may be dipped in the blood of thine enemies ... - Margin, “red.” A more literal rendering would be, “That you may crush - your foot in blood - the tongue of your dogs from the enemies, from him.” The idea of “dipping” the foot in blood is not in the passage directly; but the leading thought is that of “crushing” the enemy. It is then “added” that the foot would be in blood. So of the tongue of the dogs. The “meaning” is, that the tongues of dogs would be employed in licking up the blood of the enemies, though that is not “expressed” in so many words. The sense of the whole is, that the foes of the people would be slain.