The way renal failure is supposed to work when it's Time, is that the toxins build up so high in the blood
that they cross the blood
-brain barrier. When that happens, the dog loses its personality and really isn't "there". Well, that's the textbook case. It never really happened with Chica. She just got slower and slower and finally stopped eating the last couple of days, but her personality was still intact. She still knew us and her pack mate, Maggie.