Dogs in dreams often relate to loyalty, friendship, and protection. A friendly dog can reflect trust, support, and the people who have your back; an aggressive or biting dog may point to a conflict, a betrayal, or an instinct you're wrestling with.
The dog's behavior is the clue. A loyal companion suggests security in your relationships; a threatening dog can mirror a situation where you feel attacked or a part of yourself you're afraid of. A lost dog may reflect feeling disconnected from a friend or from your own instincts.
Ask: where do I feel loyalty and protection in my life — and where do I feel it's missing?
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Dream meanings are for reflection and self-insight — not fortune-telling or professional advice. Your own life and feelings are always the best guide.