Charles H. Spurgeon on Psalms 59:6

They return at evening. Like wild beasts that roam at night, they come forth to do mischief. If foiled in the light, they seek the more congenial darkness in which to accomplish their designs. They mean to break into the house in the dead of might. They make a noise like a dog, and go round about the city. Howling with hunger for their prey, they sneak round and round the walls, prowling with stealthy footstep, and barking in unamiable concert. David compares his foes to Eastern dogs, unowned, loathsome, degraded, lean, and hungry, and he represents them as howling with disappointment, because they cannot find the food they seek. Saul's watchmen and the cruel king himself must have raved and raged fiercely when they found the image and the pillow of goat's hair in the bed instead of David. Vain were their watchings, the victim had been delivered, and that by the daughter of the man who desired his blood. Go, ye dogs, to your kennels and gnaw your bones, for this good man is not meat for your jaws.