If acute kidney failure is not recognized and treated, cats can suffer varying degrees of permanent kidney damage and even death. (pets.webmd.com)
Only after restoring normal urine production and flow will it become clear whether permanent kidney damage has occurred and how significant the damage will be. (texaswestveterinarian.com)
Some animals may never have a reaction to grapes or raisins, but it is not worth the risk of permanent kidney damage or death to find out. (texaswestveterinarian.com)