Which condition is most likely in a large-breed dog presenting with symmetric, progressive pelvic limb ataxia and proprioceptive deficits beginning at 8 years of age with no spinal pain?
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A
Acute intervertebral disc herniation
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B
Degenerative myelopathy (DM)
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C
Lumbosacral stenosis
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D
Cervical spondylomyelopathy (Wobbler syndrome)