It should seem that this must have been a long time after what is related in the foregoing verse; probably several years, because that a famine had taken place to lead to it, of which we have no immediate account. And to what an extent must have been this famine, when the head of an ass, which was among the unclean, was sold so high. Dove's dung, it should seem, was the name of some herb, or root, or pulse.
Related Commentaries of 2 Kings 6:24
2 Kings 6:24-25
24 And it came to pass after this, that Benhadad king of Syria gathered all his host, and went up, and besieged Samaria.
25 And there was a great famine in Samaria: and, behold, they besieged it, until an ass's head was sold for fourscore pieces of silver, and the fourth part of a cab of dove's dung for five pieces of silver.