So sorry, and hoping it works out differently. My Maxwell, a dachshund, is 15. He struggles. We give him water IV subq injections every day for his kidneys. Lots of arthritis and heart issues. But he still has a gleam in his eye and he hops, thinking he is running. I am hypervigilent all the time and is breaking my heart. So you do have company in understanding.
We love our furry friends, and it is so hard to go through this.