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Easton's Bible Dictionary
As the dog was an unclean animal, the terms "dog," "dog's head," "dead dog," were used as terms of reproach or of humiliation (1 Samuel 24:14; 2 Samuel 3:8; 9:8; 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" (Psalm 22:16 ). Hazael's words, "Thy servant which is but a dog" (2 Kings 8:13 ), are spoken in mock humility=impossible that one so contemptible as he should attain to such power.
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain.
Easton, Matthew George. Entry for 'Dog'. Easton's Bible Dictionary. https://www.studylight.org/dictionaries/eng/ebd/d/dog.html. 1897.