I have read that it depends on what "type" of kidney problem it is as to wether a reduced protein diet is helpful. That probably involves some very specific testing.Thanks for the suggestions. I'm not sure what she considers low protein but the food she recommends is 12 percent crude protein. I've also been reading that reduced protein food is not necesarily the best thing for a dog with kidney issues so I'm in a bit of a quandry. The vet said it would improve his quality of life.