We know that Dachshunds are prone to back issues, but if the x-ray was clear I can not think of another cause without examining Mollie;
myelography may be useful to see if the vertebral canal
in more detail
in case there is an abnormality.
Studies that allow us to image the spinal cord can be helpful: CT scan and
myelography can help to rule out other problems; MRI may reveal areas of fluid swelling (edema) within the spinal cord
in the first few hours after FCE occurs.