Dog @ frequently mentioned both in the Old and New Testaments. Dogs were used by the Hebrews as a watch for their houses Isaiah:56:10), and for guarding their flocks Job:30:1). There were also then as now troops of semi-wild dogs that wandered about devouring dead bodies and the offal of the streets (kjvKings:14:11; 16:4; 21:19,23; 22:38; Psalms:59:6Psalms:59:14). As the dog was an unclean animal, the terms "dog," "dog's head," "dead dog," were used as terms of reproach or of humiliation ( 1Samuel:24:14; 2Samuel:3:82Samuel:9:82Samuel:16:9 ). Paul calls false apostles "dogs" Philippians:3:2). Those who are shut out of the kingdom of heaven are also so designated Revelation:22:15). Persecutors are called "dogs" Psalms:22:16). Hazael's words, "Thy servant which is but a dog" ( 2Kings:8:13), are spoken in mock humility=impossible that one so contemptible as he should attain to such power.