Ventral Slot

Cervical disc herniation often presents differently from thoracolumbar (back) disc disease. Because the cervical cord is wider and surrounded by more cerebrospinal fluid, dogs frequently experience severe neck pain with relatively preserved walking ability — though tetraparesis (weakness in all four limbs) or even tetraplegia can occur with severe compressions. Ventral slot surgery is recommended when:

• Neck pain is severe or recurring and does not respond to conservative management (rest, anti-inflammatories)
• Any degree of limb weakness is present, particularly if progressing
• Multiple episodes of cervical disc disease have occurred
• Imaging confirms single-level disc herniation at the ventral (front) midline

Conservative management (strict rest, medications) is a reasonable first attempt in dogs with pain only — but dogs with limb involvement benefit from earlier surgical intervention.

The ventral slot is performed under general anesthesia with the dog positioned on its back, neck extended. The steps:

• A midline incision is made along the underside of the neck, and the trachea and esophagus are gently retracted to expose the ventral surface of the cervical vertebrae
• The affected disc space is identified using intraoperative imaging and anatomical landmarks
• A high-speed drill is used to create a rectangular slot in the floor of the two adjacent vertebrae, exposing the disc and spinal canal
• Herniated disc material is carefully extracted using fine instruments and magnification — complete evacuation is critical
• The slot is left open (it fills with fibrous tissue over time); muscles and skin are closed in layers

The procedure addresses ventral and ventrolateral compressions directly, which makes it superior to a dorsal approach for most cervical disc herniations.

A complete neurological examination grades the degree of neck pain, limb weakness, and coordination deficits. Advanced imaging — myelogram, CT, or MRI — precisely identifies the herniated disc level and confirms ventral compression before proceeding. Pre-anesthetic bloodwork is run. For dogs with rapid neurological deterioration, imaging and surgery are arranged urgently. IV pain management begins on admission, and the team discusses the neurological baseline thoroughly with owners so that post-operative progress can be tracked accurately.

Many dogs with cervical disc disease experience dramatic pain relief within the first day after surgery. The recovery timeline varies with severity:

• Days 1–3 (hospital): pain management, neurological monitoring, supportive nursing care; most dogs are noticeably more comfortable quickly
• Weeks 1–4 (home): strict rest, short leashed bathroom trips only, harness rather than collar, continued pain medications
• Weeks 4–8: gradual return to controlled activity; neurological function continues to improve during this period
• Recheck at 6–8 weeks: neurological exam and imaging if indicated to confirm decompression and plan return to normal activity

Physiotherapy exercises prescribed during recovery help rebuild muscle strength in dogs that lost limb function. Most dogs with pain-only presentations recover completely and quickly.

Ventral slot is an effective procedure with a good safety profile in experienced hands. Specific risks include inadvertent entry into the vertebral venous sinus — which can cause significant hemorrhage, managed immediately with packing — and inadvertent spinal cord injury if the slot is drilled too deep. These complications are uncommon with meticulous technique. Post-operative neck pain is usually dramatically less than pre-operatively, and most owners note the improvement quickly. As with all cervical surgery, there is a small risk of Horner's syndrome (drooping eyelid, small pupil, sunken eye) from retraction of neck structures — this is typically temporary. Dogs that were walking before surgery almost universally recover well; those with significant limb weakness have a good but more variable prognosis.