Simba's last Vet visit was 1 month ago and had all tests and does not have arthritis. He is showing the same symptoms as all the cats I know that had or have hyperthyroidism. Eventually their hind legs become weaker and weaker. I guess I'll be taking him to the Vet the beginning of January.
Re his diet - he eats raw food, Wellness Core and sometimes, if his appetite is bad, Gerber's Stage 2 Turkey.
Just received the baby scale so I can weigh him and I'm happy to report he now weighs 9 lbs. - up from his lowest weight of 7 lbs!