Canine Degenerative Myelopathy

Canine degenerative myelopathy (DM), also known as chronic degenerative radiculomyelopathy (CDRM), is a severe neurological disease in dogs. This condition affects the spinal cord, leading to loss of coordination and eventual paralysis. It primarily affects older dogs, with certain breeds being more predisposed. Although DM is relatively uncommon, the disease’s severity often leads to euthanasia because of quality of life concerns.

The primary cause of DM is a genetic mutation in the SOD1 gene. This mutation is inherited from both parents in an autosomal recessive pattern. Dogs that receive a copy of the mutated gene from each parent are at risk of developing DM.

While there are no known secondary causes, environmental factors may influence the disease’s progression. However, these factors are not well understood and require further research to determine their effect DM’s onset and severity.

Risk factors for DM include genetic predisposition and age, with older dogs being more affected. Breeds with a known genetic tendency for the SOD1 mutation should be monitored closely for signs of DM.

• German Shepherds
• Pembroke Welsh Corgis
• Boxers
• Chesapeake Bay Retrievers
• Rhodesian Ridgebacks
• Standard Poodles
• Bernese Mountain Dogs
• Cardigan Welsh Corgis
• Great Pyrenees’
• American Eskimo Dogs

The primary symptoms of DM include hind limb weakness, loss of coordination, and difficulty standing or walking. These symptoms progressively worsen, leading to paralysis of the hind legs.

As the disease advances, secondary symptoms may develop, such as muscle atrophy and incontinence. Some dogs may also experience difficulty breathing as the condition progresses to affect the respiratory muscles.

Other symptoms can include changes in behavior because of discomfort and frustration from mobility loss. The dog’s quality of life can significantly deteriorate, making early detection and supportive care important.

Diagnosing DM involves a thorough clinical examination by a veterinarian. The veterinarian will assess the dog’s physical condition and observe clinical signs that suggest DM.

Genetic testing for the SOD1 mutation can confirm the diagnosis. This test helps differentiate DM from other conditions with similar symptoms, such as intervertebral disc disease, lumbosacral stenosis, and spinal tumors.

Imaging tests may also rule out other potential causes of the symptoms. A comprehensive evaluation ensures a correct diagnosis and informs the best course of treatment and management.

There is no cure for DM, but treatment focuses on supportive care. Physical therapy and exercises are essential for maintaining mobility for as long as possible and improving the dog’s quality of life.

Medications may be prescribed to manage pain and inflammation associated with DM. However, their effectiveness varies, and they primarily support the dog’s comfort and well-being.

Therapeutic interventions, such as hydrotherapy, can help maintain muscle strength and reduce discomfort. Regular, controlled activities can slow the progression of the disease.

Managing DM involves implementing a consistent exercise routine and incorporating physical therapy. Regular activity helps maintain muscle strength and prevents further atrophy.

Mobility aids like harnesses or carts can support the dog’s movement and enhance its quality of life. These tools let dogs continue exploring their environment despite their mobility challenges.

Regular veterinary check-ups are important to monitor the disease’s progression and adjust the management plan as needed. These visits help make sure the dog’s needs are met, and any complications are addressed promptly.

There is no known prevention for DM. However, genetic testing can identify carriers of the SOD1 mutation, helping guide responsible breeding decisions.

Breeders should prioritize genetic testing to reduce the prevalence of DM in predisposed breeds. This practice helps ensure the health and well-being of future generations of dogs.

Early detection through regular veterinary visits is essential. Catching the disease in its initial stages allows for earlier intervention and better management of symptoms.