10. His watchmen—Israel's spiritual leaders (Isa 62:6; Eze 3:17).
dumb dogs—image from bad shepherds' watchdogs, which fail to give notice, by barking, of the approach of wild beasts.
blind—(Mt 23:16).
sleeping, lying down—rather, "dreamers, sluggards" [Lowth]. Not merely sleeping inactive, but under visionary delusions.
loving to slumber—not merely slumbering involuntarily, but loving it.