I have no experience with this but it seems worthy of blogging to try and help anyone suspecting it or going thru it with their dog.
I have read that in most dogs diagnosed with IVD, its the discs gradually degenerating over the course of a lifetime. And small breeds such as Lhasa Apso, Shih Tzu, Dachshund, Pekingese, Cocker spaniel, Beagle, etc.) are termed chondrodystrophoid (KON-DRO-DIS-TRO-FOYD) and more prone to develope IVD.
Most dogs can be treated for pain and specialists will determine if the dog would benefit from surgery.