I totally understand about asking questions. The irony of this whole thing is that I lost my mother to end stage kidney disease 18 years ago. Her last months were spent in misery. I didn't always agree with those doctors and always asked many questions as my mother's advocate. I am once again in the same position with my babies.
Thank you for your suggestions to change the diet a little. I will definitely try your suggestions. I understand your reasons now why a diet for a 40 lb dog can not simply be portioned out and then be suitable for one of our tiny ones. I know my vet is like the general practitioner and doesn't know everything. Before I can ask questions, I must be informed. So, thank you all for the information, help, and support.