Dog Degenerative Myelopathy: Genetics, Progression and Support

Degenerative myelopathy is a progressive, fatal spinal cord disease in dogs that requires genetic testing and compassionate management.

Key Facts

DM is caused by a mutation in the SOD1 gene; it is an analogue of ALS in humans.
German Shepherds, Corgis, Boxers, and Chesapeake Bay Retrievers are commonly affected breeds.
Disease begins with hind limb ataxia and weakness, progressing to full paralysis over 1-3 years.
There is no effective treatment; physiotherapy and assistive devices maintain mobility and quality of life.
DNA testing identifies at-risk (homozygous SOD1 mutation) dogs before clinical signs develop.
Euthanasia decisions should be based on quality of life assessment and ability to maintain hygiene and comfort.

Welfare Considerations

DM is a welfare-challenging condition because dogs remain mentally alert throughout their physical decline. Maintaining quality of life requires wheelchairs, slings, bladder expression support, and diligent skin care to prevent pressure sores. Physiotherapy slows progression and maintains muscle mass. Owners need substantial support and clear guidance on quality-of-life assessment to make timely, compassionate end-of-life decisions.

What You Can Do

DNA test susceptible breeds before breeding; avoid homozygous-to-homozygous pairings.
Enrol in a physiotherapy programme early in the course of disease to maintain mobility as long as possible.
Consider a rear-end wheelchair to maintain mobility and quality of life as hind limb function declines.
Work with your vet using validated quality-of-life tools to plan compassionate end-of-life care.