Intervertebral Hansen type I disc extrusion is a common neurological disease in chondrodystrophoid dogs. This lesion occurs most frequently at the thoracolumbar part of the spine. The aim of this study was to describe clinical problems attributable to simultaneous disc extrusion in the Th12-13 and Th13-L1 intervertebral spaces in two shorthaired Dachshunds (6-year-old female and 9-year-old male). Both dogs lost the ability to walk suddenly, after a period of running or jumping. The diagnosis was based on clinical examination results, myelography (female dog) or myelo-CT (male dog). The dogs were treated by decompressive surgery. The female dog was euthanized during the operation because of myelomalacia. The male regained neurological function five weeks after the surgery. These two cases demonstrate the need to include double intervertebral disc extrusion in a differential diagnosis of chondrodystrophoid dogs with the palsy of pelvic limbs.
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