Spinal injury in dogs – symptoms, first aid and treatment

Overview

The spine and spinal cord are different structures

A vertebral fracture damages the back's bony supporting structure. Vertebral dislocation makes the spine unstable. Fracture stability depends on which structures are damaged. Not every vertebral fracture therefore carries the same danger from spinal movement.

Alongside bone and vertebral alignment, spinal cord function is assessed. An X-ray does not directly establish the severity of spinal cord injury. Voluntary movement can remain even with a markedly displaced fracture. This is one reason why neurological examination influences prognosis.

Spinal cord signs may be severe immediately or worsen because of an unstable injury. Secondary cord damage can also develop after the original mechanical impact. Treatment therefore aims both to address the injury and prevent further damage.

Causes

Impact and failure of spinal support

Excessive or abnormal force can cause vertebral fracture or dislocation. Common causes of spinal cord injury in dogs and cats include car accidents, bites and gunshot wounds. A fall can also injure a dog's spine.

An unstable vertebral injury can allow further displacement and damage the cord more. Fracture fragments may also enter the spinal canal. Trauma can cause a compressive haematoma or disc material extrusion.

Secondary spinal cord damage

Swelling and bleeding can develop after the mechanical impact. The insulating myelin sheath around nerve fibres can also be damaged. Nervous tissue in the injured area may die. Inflammatory mediators and free radicals released at the site can increase nervous tissue damage. They can also reduce spinal cord blood flow. Maintaining circulation and oxygen delivery therefore forms part of early care.

Risk factors

In a road accident or another major impact, a dog may sustain internal chest and abdominal injuries as well as spinal injury. A fall from a height can also involve limb and facial fractures. The accident mechanism therefore affects which injuries your vet investigates.

An attack by another animal can involve deep back and neck injuries. Shearing forces during violent shaking can damage internal structures even without a penetrating skin wound. Injury risk is therefore not judged from the size of visible skin damage alone.

Adequate blood pressure is needed for spinal cord perfusion after an accident. Achieving stable circulation also improves the reliability of consciousness and pain sensation assessment.

Typical symptoms

Signs usually start suddenly with an accident. Possible signs include:

• Back or neck pain and tenderness.
• Limb weakness and difficulty walking.
• Paralysis of the hindlimbs or several limbs.
• Loss of bladder control.
• Visible injury around the back or spine.

Severe thoracolumbar spinal cord injury can cause hindlimb paralysis and rigid forelimb extension. This is called the Schiff–Sherrington phenomenon. The posture helps locate the lesion but does not by itself determine recovery prognosis.

A concurrent head injury can alter consciousness or eye movements. Several injured regions may therefore need examination.

Shock can also involve a weak pulse.

Complications and consequences

Nervous tissue damage and permanent dysfunction

Signs of an unstable spinal injury can worsen as vertebrae move. Reduced spinal cord circulation can add to tissue destruction caused by the original injury. Loss of deep pain sensation behind the injury is associated with a poor neurological recovery prognosis.

Sacral or lumbosacral injury can cause permanent urinary or faecal incontinence. A nerve trapped at the fracture site can sustain pain. Long-term care needs therefore also depend on bladder, bowel and pain management, rather than only whether a dog can take steps.

Bladder infections are common in paralysed dogs. Dragging the legs can cause skin damage and ulcers.

Diagnosis at the vet

Vital functions before neurological examination

Airways, breathing and circulation are assessed before a detailed neurological examination. Stabilising blood pressure maintains spinal cord blood flow. Your dog is also checked for other injuries in the chest and abdomen.

Neurological examination assesses movement, proprioception, spinal reflexes and pain sensation. Deep pain sensation means a conscious response to a painful stimulus. Limb withdrawal is assessed as a separate reflex finding. Do not perform forceful squeezing or bending tests at home to judge injury severity.

X-rays, CT and MRI

An ordinary X-ray may reveal vertebral fracture or dislocation. In acute canine spinal trauma, X-ray sensitivity for vertebral fractures was 72% compared with CT. Sensitivity for partial vertebral dislocation, or subluxation, was 77%. A normal or unclear X-ray therefore does not end investigations if spinal trauma remains suspected.

CT or MRI may reveal subtler fractures, spinal canal bone fragments or traumatic disc extrusion. Detailed imaging helps plan both release of nerve compression and vertebral fixation. Blood tests, urine tests and chest or abdominal ultrasound may be needed to investigate other injuries.

Assessing injury stability

A 3-compartment model can be used to assess vertebral stability. If 2 compartments are damaged, spinal stability is likely compromised. An X-ray alone is not always enough to assess instability precisely. Stability partly determines whether rest is suitable or surgical support is needed.

Treatment

Stabilising vital functions and managing pain

A trauma patient may need oxygen and pain relief during investigations. Circulatory disturbance can be treated with fluids. Other concurrent injuries also affect treatment urgency and delivery. Your vet selects care according to the whole dog's situation.

Conservative care of a stable injury

A stable vertebral fracture can be managed without surgery if it does not cause significant instability. Mild neurological deficits may recover with 4–6 weeks of strict activity restriction and pain relief. Rest means controlled restriction rather than free movement according to the dog's wishes. Some dogs need an external spinal brace fitted by a vet.

A brace can reduce spinal bending. Its use requires careful monitoring and care. With a neck brace, watch for difficulty breathing, chewing or swallowing. Fit and skin condition are checked at agreed follow-up visits.

Surgery for an unstable vertebral injury

Severe neurological dysfunction caused by an unstable injury is an indication for surgical repair and stabilisation. Surgery corrects vertebral alignment and aims to prevent movement using fixation material. Options include screws or pins with bone cement and vertebral plates.

Compression by a bone fragment, haematoma or disc material may also require decompression. The need for surgery is assessed promptly if voluntary movements are limited or signs worsen. Detailed imaging helps choose safe fixation sites.

Prognosis depends on nervous system damage

Preserved deep pain sensation is an important favourable prognostic factor. An estimate of around 80% functional recovery after thoracolumbar injury has been reported when pain sensation remains and decompression or stabilisation is prompt. This concerns injuries treated under those conditions, rather than every paralysed dog's outlook.

Without deep pain sensation, the prognosis for neurological recovery is poor. The outlook for cervical injury may be good even without surgery if voluntary movement remains. Exercise resumes slowly and gradually after treatment.

Prevention

Keep your dog on a lead near traffic. Visibility aids help in dim light. A safe car position is on the rear seat in a seat-belt harness or a suitable crate secured to the vehicle structure. Do not restrain your dog in a car by the collar.

Check crash test reports to assess a safety device's actual protection. A deploying front-seat airbag can injure a dog. Follow agreed activity restriction during treatment even when your dog starts moving better.

A retractable lead does not provide enough control if your dog suddenly runs into the road.

Important for dog owners

Safe transport for examination

Minimise spinal movement when moving a dog with suspected back injury. A firm stretcher or flat board can provide support. Several helpers can use a blanket to move the dog carefully onto a rigid surface. Thin padding on the surface reduces pressure on the skin.

A dog is usually transported on their side, but this position may worsen breathing difficulty. With breathing problems, allow the easiest position, often resting on the breastbone. Do not prevent chest movement by tightening restraints around its widest part.

Do not force the head or neck straight if movement meets resistance, worsens signs or impairs breathing. Arrange transport for veterinary care as quickly as possible.

Rehabilitation after treatment

Physiotherapy assesses restricted movement, muscle wasting and reduced weight bearing. An exercise programme is developed individually with the vet and owner. Agreed follow-up includes reassessment of function and treatment effectiveness. Report new pain, limb weakness and urination changes to the treating vet.

Goals may include increasing weight bearing, muscle strength or joint range of movement. The rehabilitation timetable and therapies are recorded in an individual plan. Mobility aids are adjusted to the patient's own needs.

Daily care of a paralysed dog

Home care requires a clean, well-padded space that restricts movement. If your dog cannot change position, they are turned as instructed around every 3–4 hours. Safe handling after spinal injury is taught before discharge.

Urine and faeces can irritate skin and contribute to pressure sores. Bedding is kept clean and dry. Check for sores particularly around the elbows, hips, legs and tail.

Wet bedding does not prove that the bladder has emptied normally. Urine may leak by overflow from an overfull bladder. A veterinary professional teaches assisted bladder emptying where needed. Contact the treating vet immediately if urination stops or bladder emptying is uncertain.

Any nappies are changed frequently, and the skin is washed and dried where needed.

Frequently asked questions

Can a dog move their legs despite a broken spine?

Voluntary movement can remain despite a significant vertebral fracture and displacement. Spinal cord injury severity is not inferred from an X-ray alone. A dog that can still move is therefore also examined after an accident if spinal injury is suspected. Avoid unnecessary back movement until then.

Does a normal X-ray rule out spinal injury?

In acute canine spinal injuries, X-ray sensitivity for vertebral fractures was 72% compared with CT. Sensitivity for subluxations was 77%. If injury remains suspected despite a normal or unclear X-ray, more detailed imaging is needed. Testing follows the signs and initial findings.

Does every vertebral fracture need surgery?

A stable fracture may suit conservative care. This includes strict activity restriction and pain management. An unstable vertebral injury with severe neurological dysfunction often needs surgical repair and stabilisation. The method is decided after imaging and neurological examination.

How long is rest needed after a spinal injury?

Mild neurological deficits may recover with 4–6 weeks of strict rest and pain relief. A more severe injury or one needing surgery may require a different plan. Exercise resumes slowly and gradually. The end of the rest period is confirmed using your dog's own reassessment results.

Why monitor a paralysed dog's bladder?

Wet bedding in a paralysed dog may result from overflow of an excessively full bladder. It therefore does not guarantee normal emptying. A vet or nurse helps teach bladder emptying where needed. Contact the practice immediately if uncertain.