Fears, Phobias, and Separation AnxietyClinical signs, differential diagnosis, treatment and prevention in dogs, cats and horses.

Overview

Behavioral conditions, not physical diseases, arising from an animal's emotional response to a stimulus or being alone. A combination of genetic temperament, early-life experience (or lack of appropriate socialization), and specific triggering events or stimuli.

Clinical signs

Panic, hiding, vocalization, destructive behavior, and physiological signs of fear.
In prey species, responses to sounds associated with predators are highly conserved and difficult to extinguish.

Predisposing factors

Genetic susceptibility, lack of early habituation, or previous traumatic experiences.

Treatment

Behavior modification must be customized, using: (1) Desensitization: presenting the fear stimulus at a level low enough to cause only mild fear until habituation occurs.
(2) Counterconditioning: consistently pairing the fear stimulus with emotionally positive rewards.
Owners must commit to at least 1 year of therapy.
(3) Operant Conditioning: reinforcing desirable behaviors (e.g., teaching a sit-stay using the Premack Principle, where access to a desired activity is contingent on a less desirable behavior).
(4) Extinction: ending behavior by removing all reinforcement, though intermittent reinforcement increases resistance to extinction.
(5) Flooding: forcing exposure until fear is extinguished; this is rarely effective and has welfare implications, so a controlled level of flooding is preferred.

Prevention

Early socialization, systematic habituation, and avoiding the use of punishment which increases fear and anxiety.

Source

The Merck Veterinary Manual 11th Edition (Passages 293–299)

MSD Veterinary Manual — Fears, Phobias, and Anxiety Disorders in Animals (accessed 2026-08-11)

Condensed and attributed, never reproduced whole. Open the full entry in the app.