My dog suddenly screams for no reason and an X-ray showed an extra lumbar vertebra—what’s wrong?
Expert Answer
Normally a dog has seven lumbar vertebrae. Based on the image you provided—an X-ray lateral view (you mentioned a CT, which is incorrect)—the count may be unclear due to blur or overlapping shadows, so an experienced vet would determine the exact number from clear DR images and a frontal view.
As for the unexplained screaming, it is likely a sign of discomfort or pain, possibly from arthritis, strain, muscle pain, intervertebral disc herniation, or neuritis. If the attending vet cannot determine the cause from X-rays, further CT or MRI imaging is recommended for higher accuracy; a CT directly shows the disc’s position, number, shape, size, and direction of protrusion and is key for diagnosing lumbar disc herniation.
Treatment should follow the diagnosis. Early detection and treatment reduce the dog’s pain and improve recovery.