Anxiety

Anxiety is the anticipation of future dangers from unknown or imagined origins associated with fear. The most common visible behaviors are urination and/or passage of bowel movements, destruction, and excessive vocalization such as barking or whining. Fear is the instinctual feeling of apprehension resulting from a situation, person, or object presenting an external threat — whether real or perceived. Most fears, phobias, and anxieties develop at the onset of social maturity, from 12 to 36 months of age.