I am so sorry to hear about Joe and that he is gone. My name is Rebecca. I am a veterinarian and will do my best to help.
Since he had been going off his food for a couple of months, his kidney disease probably started before you noticed the change in his appetite. Getting up in the night to urinate is also a sign of kidney disease. If blood tests had been done when you took him in after he fell, you would probably have discovered that his kidneys were failing.
The carprieve was not good for his kidneys, but if it helped him to feel less pain, it was not all bad that he was given this medication for his pain. His kidneys were most likely already failing. If his kidneys were normal when the carprieve was started (unlikely in an older dog that was not eating, urinating more often, and losing weight) carprieve alone could not send up his kidney numbers as high as his were. The kidney disease was already there.
My sincere condolences for the loss of a dog that was obviously dear to you and much missed. Please let me know what other questions you have. Rebecca
You are welcome.
It is normal to feel like you do; it is grief and it will get better with time.
I don't think this came on quickly. I think it started before you first noticed the change in his appetite. I think he had chronic kidney disease that came on months ago, then you started noticing the symptoms of weight loss, loss of appetite, and more frequent urination. Most chronic diseases in older dogs start before the owners first notice the symptoms; dogs are good at hiding their not feeling good. By the time you notice they are not well, the disease is often advanced. I can't tell you how often I have seen dogs with a creatinine over 10, or a volley ball sized tumor inside them present as emergencies, and the owners were sure that the dogs were normal until that day.
Let me know how else I can help.
I am so glad I helped to make you feel better. I am quite certain you did the right thing; I would have done the same if my beloved dog had numbers as high as Joe's.
Let me know if I can help with anything else. Kindly consider rating my answer, so the website knows I assisted you and let me know how you are doing and if you get a puppy!
You can always pick up this thread again by going to My Questions on this website. Rating my answer will not close the question.
If you start a new thread, you can request me by saying "For Rebecca Only" in the opening.
Thank you for the great rating and the bonus.
Again, my sincere condolences.