Dog Syringomyelia and Chiari-Like Malformation

Syringomyelia secondary to Chiari-like malformation causes chronic neuropathic pain in affected dogs, particularly small brachycephalic breeds.

Key Facts

Cavalier King Charles Spaniels are most commonly affected with up to 95% showing skull malformation
Chiari-like malformation causes the brainstem and cerebellum to herniate into the spinal canal
Syringomyelia is a fluid-filled cavity within the spinal cord causing neuropathic pain
Phantom scratching - scratching at the neck or shoulder without touching - is a hallmark sign
MRI is required for definitive diagnosis
Pain management is the primary treatment; surgery to decompress the foramen magnum helps some dogs
Breeding protocols selecting for larger skull size are reducing prevalence in Cavaliers

Welfare Considerations

Syringomyelia causes chronic neuropathic pain that profoundly affects quality of life. Affected dogs may vocalize unpredictably, be sensitive to touch, and have interrupted sleep from discomfort. The condition is largely a consequence of selective breeding for brachycephalic skull shapes. Welfare requires both medical management for affected individuals and breeding reform to reduce prevalence.

What You Can Do

Support breeding programs using MRI screening to select against Chiari-like malformation
Advocate for breed standards that prioritize skull conformation compatible with brain health
Report unmanaged pain in dogs to your veterinarian and seek specialist neurology referral
Support research into medical and surgical treatments for syringomyelia pain management
Educate potential Cavalier owners about screening tests available from responsible breeders
Consider adopting adult Cavaliers from health-tested lines with confirmed MRI results