Very sorry to hear about your dogs and paws crossed for them both.
The treatment for this condition seems to be palliative only, IV fluid to flush out toxins from the kidneys and a low protein diet such as Hills HD.
There is now a genetic test for JRD and about 20 breeds suffer from it - there is a list and further info at
DOGenes Inc. Homepage the site of the company which has developed the dna test.
So the best hope is to notify the breeders of your dogs, and if they are caring they will have the test done on the sire and dam so no further affected puppies will be bred.
My thoughts are with you both,
Sgurr