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Fearful aggression is the second most common type of canine aggression. Fearfully aggressive dogs react inappropriately when they sense intrusion or feel cornered. This behavior may include the following:

Barking, growling, snarling
Biting
Lowering or tucking the tail
Pulling the ears back horizontally
Piloerection (fur standing on end) on the neck, shoulders, hips, and tail
Salivating or urinating
Slinking


Fearfully aggressive dogs growl or bark aggressively in situations that...Read the full article