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The dogs spine is made up of a number of vertebrae (bones), each seperated by a disc. These discs act as shock absorbers and allow movement between the vertebrae, giving the spine its flexability. Each disc is made up of a tough outer cartilage with a gelatinous centre. If the disc herniates it ruptures releasing its gelatinous fluid which creates pressure on the spinal cord. In most cases, the rupture of the disc is due tio wear and tear or abnormal pressure exerted by the vertebrae during some form of vigorous activity.
The spinal cord, which is made up of nerve fibres, runs through the spinal canal. Pressure from the gelatinous fluid causes the spinal cord formed by the vertebrae to become inflamed and swell. Subsequent damage to the cord may be partial or complete, temporary or permanent.
The common sites of disc problems are in the back, particulary in the region of the last three thoracic and first two lumbar vertebrae. Fewer problems occur in the neck.
I will tell you about the causes of slipped discs in your dog next time. Cheers.