Hoping that you soon see some results from the meds that Cinder is taking. My Pom Myndi has much the same issues and has arthritis in her legs and spine. I have had to carry her up and down steps now for a couple of years (she's 16 and under 11 lbs), but she was doing okay otherwise until a few weeks ago when her back legs just wouldn't support her anymore. I got her right in to the vet and she put her on Tramadol - 1/4 of a 50mg tablet twice a day - and I saw an immediate improvement. She can't take any anti-inflammatory meds because of GI issues, but she has been on the gluco/chrond combo for several years now. I also started giving her massages as Freedom does with Marlin, so between that and the Tramadol, her legs are keeping that little butt of hers from hitting the ground.
Prayers going out to Cinder from me and The Fuzzbuttz here in Delaware.