Do you have any results that contain things like BUN, CHOL, ALP, GGT, T4, etc? We would really like to see those results as well. We ONLY need to see the abnormal results, the ones that are too high or too low.
btw I
bolded the abnormal results on the tests you posted so they are easy to see.
Personally I don't consider the ACTH results valid since he was so stressed from the shelter and concurrent issues - (heartworms etc)
From what you told us I personally don't really see cush signs. A cush pup doesn't just have a big appetite and they don't just beg for table scrapes. They literally think they are STARVING all the time, even after eating a full meal. They will jump on the table and take your food, not beg for it. They counter-surf looking any crumbs that may be there. They will run other dogs off their food and steal it. They are in the trash hunting and often eating odd things they find outside. They are CONSTANTLY looking for food - 24/7 they are starving. You can't keep a water bowl filled up fast enough a cush pup drinks so much and they are always needing to pee, frequently having accidents. They do NOT like heat at all and will seek any cool spots. They will lay in front of fans or on vinyl/linoleum VS carpets. They would not want a sweater on any time and adore winter weather as they are finally able to cool off a bit. They pant all the time as if they had run for miles. This is how most untreated cush pups present. Rocky seems to be the opposite on most of these signs.
Alopecia is not always associated with Cushing's but can be a stand alone condition. The "harsh lungs" and grade 4 dental disease could also have an effect on the ACTH and those are some of the things I would be looking into before Cushing's - a good dental cleaning might make him feel better all around. So if I were you I would look for a UTI, get a dental done, and have his lungs further investigated. But that's me.