Intervertebral disc disease (IVDD) is one of the most common neurological disorders in dogs, causing spinal cord compression with consequent pain, weakness, and paralysis. It is the leading reason for referral to veterinary neurology specialists.
Chondrodystrophic breeds — those with abnormal cartilage development producing short, bowed limbs — are dramatically predisposed to IVDD. The Dachshund is most severely affected (25% lifetime risk of clinically significant IVDD), followed by French Bulldogs, Beagles, Cocker Spaniels, Pekingese, Shih Tzus, and Basset Hounds. In these breeds, premature disc degeneration (Hansen Type I: nucleus pulposus mineralisation and extrusion) begins in young adulthood, with peak clinical presentation at 3–7 years.
IVDD causes spinal cord compression from extruded disc material. The location of compression — cervical (neck), thoracolumbar (most common), or lumbosacral — determines the clinical signs. Thoracolumbar IVDD causes: back pain (hunched posture, reluctance to move, pain on spinal palpation), hindlimb ataxia (wobbliness), paresis (weakness), and in severe cases, complete hindlimb paralysis with loss of bladder/bowel control. The acute pain of disc herniation — often described as excruciating — and the secondary suffering from neurological deficits represent significant welfare impacts.
Conservative management: Cage rest (4–8 weeks strict confinement) with analgesics (NSAIDs, gabapentin, opioids for acute severe pain) is appropriate for mild cases without neurological deficits or for early, mild neurological signs. Success rates of 70–85% for return to function in grade I-II cases.
Surgical decompression: Hemilaminectomy (surgical removal of herniated disc material) is indicated for: dogs failing conservative management, cases with moderate-to-severe neurological deficits, and all dogs with deep pain loss. Surgical outcomes: 90–95% success for dogs with intact deep pain sensation, 50–60% for deep pain absent less than 24 hours, much lower for longer durations of pain absence. Surgery is ideally performed within 24 hours of onset for best outcomes.
Post-surgical or post-conservative management rehabilitation — physiotherapy, hydrotherapy, passive range of motion — dramatically improves recovery speed and quality of outcome. Dogs with incomplete recovery may require ongoing care for bladder management (manual expression, catheterisation) and skin care (preventing pressure sores). Wheelchairs (canine carts) restore mobility for dogs with permanent hindlimb paralysis, dramatically improving quality of life — paralysed dogs in carts can have excellent welfare outcomes.
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