And he bowed himself
In token of gratitude, and as a sign of humility, and of the sense he had of his unworthiness to enjoy such a favour:
and said, what [is] thy servant, that thou shouldest look on such a
dead dog as I [am]?
one so mean, and base, and worthless; which he might say with respect to the infirmities of his body, the rejection of his family by the Lord, their attainder of high treason for rebellion against David, and the low circumstances he was brought into and now under; though one of the royal family, the son of a prince, and grandson of a king; such was his humility, and the sense he had of his being undeserving of any favour from the king, and says this with admiration and astonishment.