CONDITION

Degenerative Myelopathy

Degenerative myelopathy is a progressive spinal cord disease affecting the white matter, causing gradual hindlimb weakness and loss of coordination, most commonly in older large-breed dogs.

Why this matters now

Degenerative myelopathy typically appears in dogs over eight years of age, with certain breeds such as German Shepherd Dogs, Boxers, and Pembroke Welsh Corgis showing increased susceptibility. The condition often develops gradually, with owners initially attributing changes to normal ageing or arthritis.

The disease progresses over months to years, beginning with subtle coordination changes in the hindlimbs and advancing to complete paralysis. Early wobbliness progresses to dragging of the hind feet, then loss of ability to stand and walk. Eventually, the front limbs become affected, and urinary and faecal incontinence may develop.

Signals & patterns

Early signals

Hind paw scuffing

Wearing of toenails on the hind feet, particularly the inner toes, from dragging during walking.

Wobbliness in hindquarters

Subtle swaying or crossing of hind legs, especially when turning or walking slowly.

Difficulty rising

Struggling to stand from lying positions, with the hindquarters appearing weak.

Knuckling of hind paws

Briefly standing on the top of the foot rather than the pads, indicating proprioceptive deficits.

Later signals

Inability to walk unassisted

Dogs require support harnesses or slings to move their hindquarters.

Dragging hind limbs

Complete loss of voluntary hindlimb movement, with legs trailing behind.

Incontinence

Loss of bladder and bowel control as the disease affects the nerves controlling these functions.

Front limb involvement

In advanced cases, weakness begins to affect the front legs as well.

Click to read about the biological mechanisms

How this is usually investigated

Diagnosis involves ruling out other causes of hindlimb weakness through a combination of neurological examination, imaging, and genetic testing, with definitive confirmation only possible through post-mortem examination.

Neurological examination

Purpose: Assesses reflexes, proprioception, and muscle tone to localise the lesion within the nervous system
Considerations: Findings help distinguish spinal cord disease from peripheral nerve problems; serial examinations track progression.

Spinal radiographs

Purpose: Rules out bony abnormalities such as tumours or severe disc disease
Considerations: Cannot visualise the spinal cord itself; may show incidental changes in older dogs.

MRI of the spine

Purpose: Visualises the spinal cord and surrounding structures in detail
Considerations: Helps exclude compressive conditions; degenerative myelopathy typically shows minimal MRI changes.

Cerebrospinal fluid analysis

Purpose: Rules out inflammatory or infectious spinal cord conditions
Considerations: Usually normal in degenerative myelopathy; requires anaesthesia.

SOD1 genetic testing

Purpose: Identifies the genetic mutation associated with increased risk
Considerations: Positive result supports diagnosis but does not confirm it; negative result makes diagnosis less likely.

Options & trade-offs

While no treatment can halt or reverse degenerative myelopathy, supportive care aims to maintain quality of life and mobility for as long as possible.

Physical rehabilitation

Exercises, hydrotherapy, and assisted walking to maintain muscle mass and mobility

Trade-offs: May slow progression and maintain function; requires ongoing commitment; does not stop disease.

Mobility aids

Harnesses, slings, and eventually wheelchairs to support movement

Trade-offs: Can significantly extend quality mobile time; requires owner involvement; cart training takes patience.

Environmental modifications

Non-slip flooring, ramps, and raised food bowls to accommodate changing abilities

Trade-offs: Improves safety and independence; relatively simple to implement; needs adjustment as disease progresses.

Skin and bladder care

Managing pressure sores and urinary hygiene in non-ambulatory patients

Trade-offs: Essential for welfare in later stages; can be demanding; prevents secondary complications.

Quality of life monitoring

Regular assessment of comfort, happiness, and dignity to guide ongoing care decisions

Trade-offs: Helps owners navigate difficult decisions; provides framework for end-of-life discussions.

Common misconceptions

Misconception:

"Degenerative myelopathy is painful"

Reality:

The disease primarily affects motor and sensory nerve fibres for position sense rather than pain pathways; affected dogs typically remain comfortable.

Misconception:

"A positive genetic test means the dog will definitely develop the disease"

Reality:

The SOD1 mutation indicates increased risk, but not all dogs carrying the mutation develop clinical signs.

Misconception:

"Wheelchairs are a last resort"

Reality:

Early introduction of mobility carts can help dogs maintain activity and muscle condition while they still have some hindlimb function.

Owners noticing progressive hindlimb weakness in their older dog may benefit from neurological evaluation to understand the cause. Knowing whether degenerative myelopathy is likely can help families plan for supportive care and make informed decisions about their dog's ongoing quality of life.

Last reviewed: 24 April 2026 · Dr Alastair Greenway MRCVS