My mother told me that here Shih Tzu/Maltese mix dog (5-6 years old) was just diagnosed with Invertebral Disc Disease. She told me that they are trying cortisone as a treatment first, but if he doesn’t respond, the only alternative is surgery that would cost $5000+. Are there any vets on the boards that might have additional information? Is this accurate? My mother is planning to have the dog euthanized if the cortisone doesn’t work, and I want to make sure she has accurate information.