I am sorry to hear about this concern.
Well, not sure the concern for early stage kidney disease if the vet said the blood test was fine? If there were kidney problems, there should have been changes in the BUN and/or creatinine on the blood test. If not present, I have no reason to believe there is any kidney problem present.
The elevated calcium (hypercalcemia) could be significant. Even if mild, that should be monitored as it can increase in the face of cancer.
The ultrasound is very subjective. If a specialist didn't do the ultrsound, then I don't know if there is anything to say about the difference in kidney size. I am more interested in whether the "architecture" of the kidney was okay. Meaning, did the cortex and shape of the kidney appear normal.
Some of his symtpoms may even be secodnary to underlying allergy issues. So, it would be interesting to see if he improved with an antihisatmine, or perhaps, a short-acting steroid shot.
Also, if not happy, ALWAYS feel free to get a copy of all records and test results,and simply consult another vet. I do second opinions where I work all of the time.
Definitely, worth a review of the results and a new exam by a different vet, so you can feel more comfortable about what you have been told.
I wouldn't worry too much about the calcium. AT 2 years of age, it is very unlikely there is a cancer issue to be thinking about.
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apparently his blood calcium came back normal. I have changed him to hypoallergenic food and he seems to be doing better. My vet suggested behaviour drugs I do not agree and refuse to do. She also suggested benedryl that just makes him sleep all day. I am very reluctant to put him on steroids I do not believe that is necessary he still refuses to go outside.