en_tn_lite_do_not_use/2sa/09/08.md

What is your servant, that you should look with favor on such a dead dog as I am?

This rhetorical question shows that Mephibosheth understands that he is not important enough for the king to take care of him. This can be translated as a statement. Alternate translation: "I am like a dead dog. I do not deserve for you to be kind to me." (See: rc://en/ta/man/jit/figs-rquestion)

such a dead dog

Here Mephibosheth represents the line of Saul, and he compares himself to a "dead dog." Dogs were feral animals, not cared for, and of little importance. A dead dog would be considered even less important. Alternate translation: "such a person like me who is worthless as a dead dog" (See: rc://en/ta/man/jit/figs-metaphor)