09/01/2026
Sometimes Dangerous Behavior Is More Than a Training Problem
There are situations in horse rescue and training that are difficult to talk about, but avoiding the conversation doesn’t make them any less real.
Recently, a mare attacked and significantly injured an experienced trainer.
I want to be very clear about something: this was not an inexperienced person who misread a horse, pushed too hard, or put herself into a situation she didn’t understand. This was an experienced trainer using appropriate body language and simply asking the mare to step out of her space and respect a reasonable boundary. She was not aggressive toward the mare. She did not provoke her. Nothing about the request warranted the severity of the response that followed.
This mare was also not a horse with a known history of abuse or mistreatment. She was raised appropriately, handled early and often, and started slowly. She may have been allowed to get away with a little too much at times, but being spoiled does not adequately explain an attack of this magnitude.
Most importantly, this incident did not occur in isolation. She was surrendered after becoming increasingly aggressive toward her previous owner.
Horses are prey animals. Their nervous systems are designed first and foremost around survival and avoidance. Yes, horses absolutely can fight, strike, bite, kick and charge when they perceive that fighting is necessary—but context matters. There is a difference between a defensive reaction, learned disrespect, fear-based aggression and behavior that appears profoundly disproportionate, unpredictable or disconnected from the situation occurring in front of the horse.
When behavior reaches this level, I believe we owe the horse—and the humans responsible for her—the consideration that something more may be happening.
Severe, seemingly unprovoked behavioral changes can warrant investigation for pain and underlying medical or neurologic disease. Depending upon the individual horse, possibilities that may need to be ruled out could include spinal or neurologic pathology, nerve involvement, significant pain triggered by particular movements or positions, previous injury, intracranial disease or other abnormalities affecting normal neurologic function and behavior.
That does not mean we can diagnose the cause of this mare’s behavior from one incident. We cannot. It means behavior this extreme deserves to be taken seriously enough to investigate rather than simply labeling the horse “bad” or blaming the person who was hurt.
And there is another uncomfortable reality we have to acknowledge.
When aggression becomes severe, escalating and unpredictable, the question can no longer be only, “Can someone experienced enough handle this horse?”
The questions become:
Can we reasonably predict when she will become dangerous?
Can we keep veterinarians, farriers, handlers, adopters and bystanders safe?
Can she ever ethically be placed into another home?
And, most importantly, is there an underlying condition causing her pain, fear, confusion or neurologic dysfunction that is compromising her own quality of life?
Experience does not make someone immune to a 1,000-pound animal capable of inflicting catastrophic injury. Passing a profoundly unpredictable horse from one experienced person to the next is not necessarily rescue.
Sometimes responsible horsemanship means recognizing that there may not be a safe placement.
And sometimes loving a horse means being willing to make an extraordinarily difficult decision if diagnostics, prognosis, safety and quality of life tell us that there is no reasonable path forward.
I trust Carrie and Dr. King to evaluate this mare carefully and make the decision that is ultimately in the best interest of the mare and everyone who would be responsible for her care.
