Can i just say that although you are feeding a diet for kidney failure do check out a number of kidney diets as they can vary, get the one with the lowest protein and the lowest phosphorous.

We had a springer who had kidney failure caused by an enlarged heart causing congestive heart failure, he lost loads of what we thought was weight but it was actually muscle he was losing thats how his kidney failure was recognised, he was given every 6 weeks a steroid injection, dont know wether your dog is getting thin but if she is you could ask for this if she is, as little muscle left him very weak.