11/28/2025
This is NOT anthropomorphism - it’s mammalian neuroscience. To be clear.
Most horse people have heard the term trigger stacking, but few truly understand what’s happening inside the horse’s body when it occurs. And fewer realise that humans experience the exact same nervous-system process.
This is not “treating horses like humans.” This is a biological truth.
Horses and humans share the same basic mammalian nervous system:
• sympathetic (fight/flight)
• parasympathetic (rest/digest)
• vagus nerve
• thresholds
• stress hormones
• startle responses
So comparing the experience is not only valid but it helps people understand, relate, and develop compassion.
So let us look at YOU the human reading this:
Think of a day like this:
• didn’t sleep well
• you’re running late
• the kids are shouting
• you stub your toe
• your phone keeps pinging
• someone snaps at you
• you’re worried about money
• the traffic is heavy
• you spill your coffee
You hold it together… until someone asks something tiny of you:
“Can you just... ?”
And suddenly you:
• snap
• cry
• shut down
• withdraw
• feel overwhelmed
• can’t cope
• overreact to something small
People think it was “the last thing.” But you know it wasn’t.
It was everything before it that pushed you past threshold.
This is trigger stacking.
And your reaction was NOT a meltdown, or disobedience, or manipulation. It was your nervous system saying:
“I cannot take one more demand.” and guess what friends? Horses are no different. Not because they are human like but because we share the same biological wiring. Isn't that just fascinating to comprehend?
Now, lets translate that from a horse's perspective...
A horse’s day might look like:
• didn’t sleep lying down
• herd tension
• flies irritating
• heat or humidity
• slight hoof discomfort
• a loud noise earlier
• a new horse on the farm
• a human arriving stressed
• pressure from the halter
• the saddle pinching
• uncertainty about what’s coming next
None of these alone may cause a big reaction. But inside the body, each one is adding sympathetic charge and slowly building on top of eachother stacking and stacking...
• small adrenaline spikes
• cortisol accumulation
• reduction in vagal tone
• increased muscle tension
• faster startle reflex
• sensory overload
• hypervigilance
Just like a human, the horse’s system is slowly filling the bucket.
Then the final moment happens when it all becomes too much:
• “Walk on.”
• “Just stand still.”
• “One more try.”
• someone closes a gate too loudly
• a bird takes off
• a leaf rustles
• your energy spikes
And the horse:
• spooks
• bolts
• balks
• bucks
• freezes
• shuts down
• refuses
People say, UGH “That came out of nowhere.” But it didn’t. It really did not. It came from every single moment that added to the stack.... Just like you.
This is NOT humanising horses. It is recognising shared mammalian reality.
When horses (and humans) experience multiple stressors, the same biological cascade happens:
• sympathetic activation rises
• cortisol stays elevated
• heart-rate variability decreases
• prefrontal cortex (thinking brain) goes offline
• limbic system (survival brain) takes over
• proprioception changes
• muscles brace
• breath shortens
• tolerance shrinks
This is why neither horse nor human can “think clearly” once the stack is high.
Neither is “naughty.”
Neither is “difficult.”
Neither is “dramatic.”
Both are overwhelmed. Let us please see it for what it is, in eachother and in horses.
And this is not anthropomorphising. Anthropomorphism is actually giving horses human thoughts, motives, or stories. This is different.
This is comparing shared physiology:
✓ We both have amygdalas
✓ We both have vagus nerves
✓ We both produce cortisol + adrenaline
✓ We both have startle reflexes
✓ We both have thresholds
✓ We both get overwhelmed
✓ We both shut down when we exceed capacity
This isn’t “treating horses like humans.” It’s understanding horses better by recognising what is universal to all mammals. You have lived through trigger stacking. You know what it feels like.
So when you see a horse “explode,” or “go blank,” or “overreact,” or “say no” - instead of judging, you understand.
You feel compassion. You soften. You respond differently.
This is why relating horse and human nervous systems is not anthropomorphism - it’s empathy rooted in biology.
How do we support our horses through trigger stacking?
Preventing the stack means supporting the nervous system:
Environmental
• herd stability
• forage
• movement
• predictable routine
Physical
• pain checks
• saddle fit
• hoof care
• vet care
• bodywork
Relational
• clear, consistent boundaries
• choice
• slowing down
• not pushing past threshold
Co-regulation
• you regulate first
• stable breath
• soft intention
• calm posture
• reading early signs
You are either lowering the stack… or unintentionally adding to it.
Horses don’t “react out of nowhere.” They react when their system can no longer cope, the same way you do.
When you realise this, everything shifts:
• behaviour becomes communication
• resistance becomes protection
• “naughty” becomes overwhelmed
• training becomes partnership
• pressure becomes patience
• correction becomes compassion
And the horse softens - not because they’re forced to… but because they finally feel safe. Just like you do when someone holds space for you, stays regulated when you can’t, listens without judgment, and meets you with gentleness instead of pressure.
We are not so different when it comes to how we feel things in our bodies. Meet the horse the way you would want to be met. ❤️
