Misha just started being unable to walk or use his back legs. His eyes were moving rapidly side-to-side (nystagmus) and his whole body was curled. We thought it was the end as he is so old (nearly 16).
The vet diagnosed vestibular disease and we are really keeping fingers crossed that it is the typical old dog kind where they recover within 3 days.
Please keep Misha in your thoughts - he means the world to me. If anyone else has experienced this, please let me know.