senior panting

Hi, I have a 13-year old golden boy named Lucky. We're going through all the usual senior issues with arthritis, skin infections, etc. Most recently, my vet told me that she thinks he may have Cushing's, mainly because he seems to be panting a lot. He's already on metacam (arthritis)...

I have a 14 1/2 year old - overall in great shape and he has had outstanding care. He has never had arthritis but his legs are starting to lose muscle mass (he also has gone to a dog chiro since he was young). He was on metacam and then switched him to rimadyl. Took him off the rimadyl hoping...