Maybe get a second opinion on what you're doing is the correct approach. What exactly caused the kidneys to start failing? Usually iv's are given to help reduce so much filtering at once by the kidneys.. create a gofundme page.. you might get sime help from friends/facebook friends of friends. Many have a soft spot for pets, even when they know the person.
I wish I had an answer for you, but I do feel your pain. Our 6 year old lab was diagnosed with Kidney disease from Lyme. Last week she was a beautiful, spunky lab. This week she just lays around. We are hydrating her daily also, giving her meds. Vet is very vague about outlook because we are still in the stages of diagnosis of severity. We also had an ultrasaound done and found that she has no spleen or adrenal glands. I am as a loss for words for you, and my heart is heavy for both of us. I just can't bear to let go yet, but I fear also that this is going to be an expensive road. If only they could talk to us..Good luck you and your family. I wish I could help you more..I am seeking answers also. Kidney disease is bad enough, but wtf do we do about missing body parts too???