Horse Down and Unable to Get Up: Neurologic and Musculoskeletal Causes

A horse that is down and unable to get up is described as recumbent. Some horses are briefly recumbent from exhaustion, sedation, or a painful episode and can rise once the problem passes. Others cannot stand because something is preventing normal strength, coordination, or weight-bearing. In horses, that can become life-threatening fast.

Recumbency is not a diagnosis by itself. It is a sign that may come from a neurologic problem affecting the brain, spinal cord, nerves, or neuromuscular system, or from a musculoskeletal problem such as severe pain, fracture, tendon or ligament injury, pelvic trauma, or muscle damage. Metabolic disease can also contribute by causing weakness, tremors, or collapse.

Time matters. A horse's body weight can compress muscles and nerves when the horse stays down, especially if it is lying on one side for long periods. Recumbent horses can also develop breathing problems, pressure sores, dehydration, and self-trauma if they struggle. That is why this situation needs rapid veterinary assessment, even if the horse seems calm.

Neurologic causes include diseases that affect the brain, spinal cord, or peripheral nerves. Examples include equine protozoal myeloencephalitis (EPM), equine herpesvirus-1 myeloencephalopathy, West Nile virus and other equine encephalitides, spinal trauma, cervical spinal cord compression, rabies, botulism, and some inherited or degenerative neuromuscular disorders. These horses may look weak, uncoordinated, mentally dull, unable to swallow normally, or unable to control the tail, bladder, or hind limbs.

Musculoskeletal causes are also common. A horse may be unable to rise because standing is too painful or mechanically impossible. This can happen with fractures, pelvic injury, severe laminitis, tendon or ligament rupture, joint injury, severe soft tissue trauma, or exertional rhabdomyolysis. In rhabdomyolysis, damaged muscles become painful and hard, and the horse may sweat, tremble, and refuse to move.

Metabolic and systemic disease can overlap with both groups. Hypocalcemia can cause weakness, tremors, colic-like signs, and recumbency. Severe exhaustion, shock, toxic disease, or prolonged anesthesia recovery can also leave a horse unable to stand. In some cases, a horse is initially down for one reason and then develops secondary muscle and nerve damage from staying recumbent too long, which makes rising even harder.

Because the list is broad, your vet will focus first on the most urgent possibilities: trauma, fracture, severe muscle injury, infectious neurologic disease, and conditions that affect breathing or safety.

Your vet will start with the horse's history and a careful physical exam. They will want to know how long your horse has been down, whether there was trauma, fever, recent travel, vaccination history, exercise, exposure to opossums or mosquitoes, and whether the horse showed weakness, lameness, or behavior changes before going down. Safety comes first, so sedation may be needed before a full exam.

The exam usually includes assessment of mentation, cranial nerves, limb movement, muscle tone, pain, and the ability to bear weight if the horse can be assisted up. Your vet may also perform a focused lameness and orthopedic exam, looking for fractures, pelvic asymmetry, hoof pain, tendon injury, or severe muscle damage. If no obvious painful cause is found, a neurologic exam becomes especially important.

Common tests include bloodwork, muscle enzymes such as CK and AST, electrolytes including calcium, and sometimes urinalysis. Depending on the case, your vet may recommend radiographs, ultrasound, cerebrospinal fluid testing, infectious disease testing, or referral imaging. These tests help separate neurologic disease from orthopedic injury and identify conditions like EPM, viral encephalitis, metabolic disease, or severe rhabdomyolysis.

In some horses, diagnosis and treatment happen at the same time. For example, your vet may need to stabilize pain, protect the horse from self-injury, rotate the horse, or attempt assisted standing while continuing the workup. Prognosis often depends on the underlying cause, how long the horse has been recumbent, and whether the horse can stand and remain standing once helped.

Not every case can be prevented, but you can lower risk by working with your vet on routine vaccination, conditioning, hoof care, and prompt evaluation of lameness or neurologic changes. Core vaccination against West Nile virus and Eastern/Western equine encephalomyelitis is an important part of prevention, and mosquito control adds another layer of protection.

Good management matters too. Keep footing as safe as possible, condition horses gradually, and address tying-up episodes, severe stiffness, or repeated weakness early. Horses with known neurologic disease, severe arthritis, or muscle disorders may need tailored turnout, exercise, and monitoring plans.

Call your vet promptly for ataxia, stumbling, urine dribbling, trouble swallowing, severe muscle pain, or sudden non-weight-bearing lameness. Early treatment may prevent a horse from becoming recumbent in the first place. If your horse does go down, having an emergency plan, trailer access, and your vet's after-hours number ready can save valuable time.