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Leukoencephalomyelopathy, often abbreviated as LEMP, is a rare but serious inherited neurological disorder that affects the spinal cord and brain’s white matter in dogs. While not as common as other spinal diseases, it can cause significant mobility challenges, especially in affected breeds like Rottweilers and Leonbergers.
Understanding this condition fully can help dog owners recognize early symptoms, seek the right diagnosis, and explore supportive care options to improve quality of life.
Whether you’re a pet parent, veterinarian, or caregiver for a disabled dog, this page provides a detailed look at what LEMP is, what causes it, and how to manage its impact on your dog’s mobility and daily function.
What is leukoencephalomyelopathy (LEMP) in dogs?
LEMP is a progressive neurodegenerative disease that affects the white matter in a dog’s central nervous system, including both the brain (leukoencephalo-) and the spinal cord (myelopathy).
White matter consists of nerve fibers that help transmit messages between different parts of the nervous system. In dogs with LEMP, this white matter deteriorates over time, leading to problems with coordination, balance, and motor control.
The condition is inherited in an autosomal recessive manner, which means a dog must inherit two copies of the mutated gene (one from each parent) to develop the disease.
What causes LEMP in dogs?
LEMP is caused by a specific genetic mutation that disrupts normal development and maintenance of the white matter in the brain and spinal cord. Different breeds have different known mutations:
Leonbergers: A mutation in the NAPEPLD gene has been identified.
Rottweilers: A different form of the disease exists but the exact mutation may vary or remain under research.
Because of its genetic basis, the condition is passed down through breeding lines. Dogs that inherit only one copy of the gene typically do not show symptoms but can pass the gene to their offspring.
Breeding programs can screen for the
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