Degenerative Myelopathy in Dogs: Causes, Symptoms, Treatment

Understanding Degenerative Myelopathy in Dogs

Degenerative myelopathy (DM) is a progressive neurological disorder that affects the spinal cord of dogs, leading to progressive loss of function in the hind limbs. This disease is particularly common in certain dog breeds and typically develops in middle-aged to senior dogs. While DM cannot be cured, understanding the condition and implementing appropriate management strategies can help maintain your dog’s quality of life for as long as possible.

The disease process in DM involves the gradual degeneration of nerve fibers in the spinal cord, which disrupts communication between the spinal cord and the brain. This breakdown in neural communication results in progressive weakness and loss of coordination, typically starting in the hind limbs and potentially progressing toward the front of the body as the disease advances.

What Causes Degenerative Myelopathy?

Degenerative myelopathy is primarily associated with a genetic mutation in the SOD1 gene, which affects how cells handle oxidative stress. This genetic predisposition is why certain breeds, particularly German Shepherds, Boxers, Rhodesian Ridgebacks, and Pembroke Welsh Corgis, show higher incidence rates of the disease. However, having the genetic mutation does not guarantee that a dog will develop clinical signs of DM, as the disease requires specific genetic and environmental factors to manifest.

The progressive nature of DM stems from the accumulation of cellular damage in motor neurons of the spinal cord. Over time, this damage leads to neuronal death and loss of myelin, the protective covering around nerve fibers, ultimately resulting in the clinical signs associated with the disease.

Recognizing the Clinical Signs of Degenerative Myelopathy

Degenerative myelopathy is a progressive disease, meaning symptoms change and worsen over time. Early recognition of clinical signs is important for beginning supportive care promptly. The following symptoms typically develop in a predictable pattern:

Early Stage Symptoms

In the early stages of DM, owners often notice subtle changes in their dog’s mobility and gait. These initial signs include:

• Knuckling or dragging the toes, particularly of the hind feet
• Walking on the tops of the feet or wrists
• Loss of coordination (ataxia), causing an unsteady gait
• Difficulty standing from a resting position
• Hind limb weakness that may be more noticeable after rest or exercise

Progressive Stage Symptoms

As DM progresses, the weakness becomes more pronounced and affects a larger portion of the body:

• Increased loss of muscle mass (muscle atrophy), particularly in the hind limbs
• Reduced ability to stand independently
• Eventual loss of the ability to stand on hind legs
• Bowel and urinary incontinence as nerve damage extends
• Loss of sensation in the hind limbs
• Complete paralysis of the hind limbs

Advanced Stage Symptoms

In advanced stages, dogs may experience:

• Complete inability to stand, even with assistance
• Loss of bladder and bowel control
• Gradual weakness in the front limbs
• Difficulty with breathing and swallowing in severe cases
• Complete paraplegia

Disease Progression Timeline

The progression of degenerative myelopathy varies between individual dogs, but understanding typical timelines can help with planning and decision-making. Most dogs diagnosed with DM become paraplegic within six months to one year from the onset of clinical signs. However, some dogs progress more slowly, while others decline more rapidly. The median survival time for dogs with DM ranges from 10 to 36 months after diagnosis, though this can vary significantly based on the individual dog’s response to management and the intensity of physical rehabilitation provided.

Diagnosing Degenerative Myelopathy

Accurate diagnosis of DM is important because similar clinical signs can indicate other diseases affecting the spinal cord or neurological system. A veterinarian will use several diagnostic approaches to confirm DM:

Clinical Examination and History

Your veterinarian will begin with a thorough physical and neurological examination to assess your dog’s gait, reflexes, and neurological function. They will also take a detailed history of when symptoms began, how quickly they’ve progressed, and any other health conditions your dog may have.

SOD1 Gene Testing

SOD1 testing is the most commonly used diagnostic tool for presumptive diagnosis of DM. This genetic test identifies whether your dog carries the SOD1 mutation associated with degenerative myelopathy. A positive SOD1 test, combined with compatible clinical signs, strongly suggests DM, though it’s important to note that not all dogs with the SOD1 mutation will develop clinical disease.

Spinal MRI

Magnetic resonance imaging (MRI) of the spine can be performed to help rule out other conditions that may mimic DM, such as intervertebral disc disease or spinal cord tumors. While MRI is less commonly used for DM diagnosis than SOD1 testing, it can be valuable when other spinal cord diseases need to be excluded.

Additional Diagnostic Considerations

Your veterinarian may recommend other tests or imaging to rule out concurrent conditions such as hip dysplasia or arthritis, which can complicate mobility issues and may warrant separate treatment approaches.

Treatment Options for Degenerative Myelopathy

Current State of Medical Treatment

Unfortunately, there is no cure for degenerative myelopathy, and no medical therapies have been proven to alter the progression of DM. Previous research has examined various pharmaceutical interventions, including ε-aminocaproic acid, N-acetylcysteine, and supplementation with vitamins C and E, but none have demonstrated evidence of benefit in slowing disease progression.

Physical Therapy and Exercise: The Foundation of Management

Physical therapy is the only treatment modality that has been shown to be genuinely helpful in managing degenerative myelopathy. Research demonstrates that dogs receiving physical therapy can typically maintain mobility longer than those who do not receive such treatment.

Intensity and Frequency Matter

The intensity and frequency of physical therapy are critical factors in achieving positive outcomes. More rigorous rehabilitation programs produce better results in dogs with DM. Ideally, structured exercise programs should be performed as frequently as possible, preferably daily, to maximize benefits. Studies show that dogs receiving intensive daily physical rehabilitation, including gait exercises performed 3-5 times daily combined with passive range of motion, massage, or daily hydrotherapy, survived longer and remained ambulatory longer than dogs receiving moderate or no rehabilitation.

Recommended Physical Therapy Exercises

Various physical therapy modalities have been shown to be effective in supporting dogs with DM:

• Swimming and underwater treadmill therapy: Water-based exercises are particularly beneficial as they reduce stress on joints while maintaining muscle strength and coordination
• Short, frequent walks: Regular walking on level surfaces helps maintain muscle tone and coordination
• Hill walking: Walking on inclines provides additional strengthening benefits for hind limb muscles
• Assisted stretching: Gentle stretching helps maintain flexibility and range of motion
• Massage therapy: Enhances blood flow through muscles and addresses areas of tension
• Sit-to-stand exercises: Helps maintain strength in the muscles needed for standing
• Assisted walking with slings, harnesses, or wheelchairs: Provides support as mobility declines, allowing dogs to remain active longer
• Electrotherapy and laser therapy: Adjunctive modalities used by rehabilitation professionals to support therapeutic outcomes

Professional Rehabilitation vs. Home Exercises

While professional in-clinic rehabilitation is valuable, with the majority of rehabilitation clinicians recommending once or twice weekly sessions, home exercises form the foundation of successful management. At-home exercise programs are critical because they allow for the frequent, consistent activity that produces the best outcomes. Most rehabilitation professionals report that at-home exercises are used to maintain strength, coordination, and muscle mass while improving overall wellbeing.

Supportive Care Strategies

Weight Management

Maintaining a healthy weight is crucial for dogs with DM, as extra weight places additional stress on compromised limbs and can accelerate decline in mobility. Diet and exercise should be carefully managed to keep your dog at an ideal body condition.

Home Modifications

As DM progresses, environmental modifications can significantly improve your dog’s comfort and safety:

• Using rugs, carpets, or yoga mats on hardwood or tiled surfaces to improve traction
• Adding pet ramps or steps to reduce strain on affected limbs when accessing furniture or vehicles
• Providing a sling or harness to assist with walking and standing
• Using booties to protect paws from damage caused by dragging or scuffing
• Considering a wheelchair to support hind limbs in advanced stages

Addressing Concurrent Conditions

Treatment of other concurrent problems, such as arthritis or hip dysplasia, may provide additional relief and improve overall mobility. Addressing these secondary conditions ensures that your dog’s decline is not unnecessarily accelerated by untreated joint disease.

Preventing Secondary Complications

As DM progresses and dogs lose mobility, awareness of potential secondary complications becomes increasingly important. These may include decubitus ulcers (pressure sores), urinary tract infections from incontinence, and damage to paw pads from dragging. Proper nursing care, frequent position changes, and appropriate wound management can help prevent or minimize these complications.

Long-Term Management and Quality of Life

The goal of DM management is to maintain your dog on its feet for as long as possible while preserving quality of life. This requires a comprehensive, individualized approach that combines appropriate exercise, home modifications, weight management, and supportive care. Many rehabilitation professionals report stabilization of disease progression and improved wellbeing in dogs undergoing physical rehabilitation, even though the disease ultimately cannot be stopped.

Every dog with DM has different needs, and your veterinarian can help create a management plan tailored to your dog’s specific stage of disease and individual circumstances. Regular communication with your veterinary team allows for adjustments to the care plan as new symptoms emerge.

Prognosis and End-of-Life Considerations

While DM is progressive and ultimately degenerative, the timeline varies considerably among individual dogs. The decision to pursue euthanasia is deeply personal and should be made in consultation with your veterinarian when your dog’s quality of life is no longer acceptable. Some owners choose euthanasia when dogs become nonambulatory, while others continue care through advanced stages with assistance devices like wheelchairs. The most important consideration is ensuring your dog remains comfortable and maintains an acceptable quality of life.

Frequently Asked Questions About Degenerative Myelopathy

Q: Is degenerative myelopathy painful?

A: DM itself is not typically considered a painful condition, though dogs may experience discomfort from secondary issues like muscle tension, arthritis, or pressure sores. Physical therapy and massage can help address these secondary sources of discomfort.

Q: Can degenerative myelopathy be prevented?

A: While you cannot prevent DM in dogs with the SOD1 mutation, responsible breeding practices that screen for the mutation can reduce its prevalence in future generations. If your dog has DM, maintaining appropriate weight, providing regular exercise, and avoiding obesity may help slow progression.

Q: How much physical therapy does my dog need?

A: Ideally, dogs with DM should receive structured physical therapy as frequently as possible, preferably daily. Most rehabilitation professionals recommend once or twice weekly professional sessions supplemented with daily home exercises for optimal results.

Q: Will my dog need a wheelchair?

A: Whether a wheelchair is necessary depends on the stage of your dog’s disease and your management goals. Wheelchairs can help dogs with advanced DM remain mobile and active, though they require owner commitment and may not be suitable for all dogs or living situations.

Q: Are there any new treatments being developed for DM?

A: Researchers are actively investigating potential treatments for DM. Some studies are examining drugs like riluzole, which is already approved for treating ALS in humans, as potential therapeutic options for slowing DM progression in dogs.

Q: What should I do if my veterinarian suspects degenerative myelopathy?

A: Request SOD1 genetic testing and discuss referral to a veterinary neurologist or rehabilitation specialist. Early intervention with physical therapy and environmental modifications can help slow progression and maintain quality of life.

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Sneha TeteBeauty & Lifestyle Writer

 

Sneha is a relationships and lifestyle writer with a strong foundation in applied linguistics and certified training in relationship coaching. She brings over five years of writing experience to fluffyaffair,  crafting thoughtful, research-driven content that empowers readers to build healthier relationships, boost emotional well-being, and embrace holistic living.

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