My kids' kindergarten teacher gave us a copy of
Dog Heaven when we lost one of our dogs. She meant it for the kids, but I think it helped me more.
I know this isn't what you asked for, but I thought I'd offer it anyway since maybe you hadn't thought of it. My German Shepherd Cody had myelopathy too from arthritis of the spine. It was a shame because he was otherwise very healthy and happy. He slowly he lost his ability to walk. I'd hired a pet sitter who happened to be a physical therapist, and she asked me if we'd ever thought of "wheels" for him. We really hadn't, but I thought it was worth a look. I found
this company who built us a set of custom wheels for him (there is a section on their website about degenerative myelopathy). We had them within two weeks of the therapist's suggestion. It was great to see Cody join us for daily walks and even actually run again! Just a thought if it might work for your dog.