03/03/2026
How do we begin to understand emotional/psychological trauma in horses? Because we don't have verbal language, we have to rely on changes in baseline emotional state or behavior norms.
Trauma, in horses, is when the neurological baselines change due to exposure to aversive events or chronic stress, we see it in lasting behavioral or emotional changes to the horse's old normal. Usually we see increased fear, anxiety, hypervigilance, and combative behavioral changes that last even when the event is over and threats are gone. It can be caused by one extreme scenario or repeated/prolonged events.
This is different than Learned Helplessness, which is more about feeling that the bad things are unavoidable and out of control. While with trauma we see increased fear and lowered threshold for reactivity. The horse is more fearful in general and has less ability to control their response to their fear.
While a horse in Learned Helplessness often mimics calm in their overly-passive, empty compliance, a horse with trauma is more likely to have loud emotional reactions. Their underlying state of anxiety and vigilance will be present all the time limiting their ability to focus, learn, and process their emotions, even when we know they're safe. This will be where horses rapidly try to avoid all scary things, they avoid being caught, avoid tack/tools, and can be extremely skittish to every little change in the environment. Some horses may not always go right to avoidance but turn to aggression instead.
Trauma causes neurological changes to the horse, increasing their baseline stress hormones. Remember how stimulus stacks work? Trauma is like always having an active aversive in the stimulus stack, before anything actually happens externally. Which is why they have a much smaller window for tolerance and resilience. Their ability to handle and process new or potentially threatening things is diminished.
Sometimes trauma remains focused on the specific event that caused it. If a horse had trauma associated with a trailer, for example, they may only have this extreme heightened state of arousal when in or around trailers. While sometimes memories of the traumatic event get blurry or blend with other memories, sometimes these traumatic events aren't so clearly isolated to one specific scenario. That's when we begin to see horses whose trauma becomes their daily life baseline, not context specific. They may become afraid of all tight spaces, ramps, steps up, metal sounds, gas or rubber smells, or anything else they may associate – or even entirely unrelated things that are just somehow associated in their mind, even if it doesn't make sense to us.
We've organized these into categories, just for easier understanding of where a horse is at, emotionally.
Mild: This is context-specific fear or anxiety; it resolves with a change of context and is often easy to overcome with compassionate training.
Moderate: Ongoing anxiety or fear that interferes with daily life, training or focus. This might mean the horse is more jumpy, reactive, or just has a lower threshold for resilience to hard things. May show signs of avoidance (difficulty being caught or fidgety to avoid handling) or mild aggression (like bite or kick threats while being handled).
Severe: Distracting levels of fear and stress that interfere with daily functions. Handling is extremely difficult, the horse is reactive, dangerous, aggressive or very flighty. There are serious, visible behavioral changes. This interferes with all learning and processing new things and begins damaging their physical health from the stress.
Extreme: Welfare damaging levels of anxiety, chronic stress and levels of fear making them unsafe to handle or be provided care. Unpredictable reactions with constant, chronic strain, damaging their quality of life as a whole.
Certain types of trauma can affect different aspects of a horse's life. We usually recognize trauma by the emotional displays, generalized anxiety, irritability, mood swings, and so on, but there are other parts of life trauma can influence. We may see a horse who has social trauma, specifically with other horses or just humans. We'll see these horses avoid or self-isolate or become aggressive to others. Some have sensory-motor affected trauma, causing gait instability, avoidance of movement, and heightened fear responses due to movement related fear. Some trauma events can impair learning, reducing their ability to problem solve and discriminate tasks. They may avoid situations where they have to think or try new things, they have slower extinction and reduced resilience.
Recognizing trauma is the first step to begin to help them heal. Horses are not just over dramatic or difficult for no reason. These baseline changes happen as a result of something.
