Hi and thanks for your thoughtful response!
You have mentioned many things we explored on our way through this experience. He and Molly both ate Purina 1 initially and now Science Diet. Everything I could find about low thiamine levels was related to raw or homemade diets--which doesn't apply...
We have a beautiful 2 year old cat Fionn, who at one year of age started walking on his whole back leg (like a rabbit). This came and went a few times and the orthopedic specialist diagnosed knees that slipped out of joint and recommended surgery in the future. As we waited-Fionn started having...