Abuse, lack of socialization, genetics can cause fear aggression. But often the underlying cause is unknown.
Growling, baring teeth, snarling, snapping, stiff body, tucked tail, avoidance, hiding
Positive reinforcement training, counterconditioning, desensitization, medication can help fearful dogs become more confident.
Don't force interactions. Allow fearful dog space and let them make the approach. Reward calm behavior.
Basic commands build confidence. Reward and praise good behavior.
Stick to routine and training. Build trust through patience and understanding.
If fear aggression persists, consult certified dog behavior professional for customized behavior modification plan.