Here is what I found quickly, but you probably already read it:
http://healthypets.mercola.com/sites/healthypets/archive/2013/06/03/fibrocartilaginous-embolism.aspx
Just a few paragraphs but much more in the linked article
A fibrocartilaginous embolism, or FCE for short, is a blockage in a blood vessel in the spinal cord. It’s often referred to as a spinal cord stroke.
A fibrocartilaginous embolism occurs when a fragment of the nucleus pulposus inside an intervertebral disc escapes into the blood vessel of the spinal cord and causes an obstruction. This affected area of the spinal cord then dies.
Unfortunately, neurologic loss that occurs within the first 24 hours is usually permanent. The good news is the condition isn’t progressive. Any pain usually resolves within 12 to 24 hours. And with immediate treatment, primarily involving very intensive physical therapy, most dogs experience significant recovery.
An FCE typically results from an injury to the spinal cord often caused when a dog jumps or lands awkwardly. Sometimes vigorous exercise can do it. Dog fights, really rough play, or any sort of accidental trauma can also lead to an FCE.
Fibrocartilaginous emboli are rarely seen in cats and occur most often in large and giant breed male dogs, and also miniature Schnauzers and Shelties between three and six years of age. It’s possible an underlying condition common in these breeds called hyperlipidemia, which is a high blood cholesterol level, could be a contributing factor in smaller dogs who acquire the condition.
....
The recommended treatment for FCE, even with animals with a poor prognosis due to swelling or decreased pain sensation, is to begin immediate and aggressive physical therapy.
Studies show that physiotherapy instituted immediately after diagnosis can have a major influence on recovery. This should include hydrotherapy (walking on an underwater treadmill), as well as acupuncture, laser therapy, neuromuscular electrical stimulation, range of motion exercises, massage, and supplements."
Getting some medical info from the vet and some info on line but has anyone here experienced this with their dog? I am worried about her - she's only 8 years old and this happened very suddenly. She is now paralyzed pretty much from the waist down. 
