I am so sorry Molly is so ill. Renal failure is weird...they can sometimes turn around and do well for a time...then, other times they fail quickly.
One of my pups currently is in renal failure. Rookie is his name. He has been ill for about three years now but has been hanging in. He has been diagnosed with PLN and PLE ... I had him at the vet yesterday for blood work and his BUN 73, Creat 3.9 .. phosporous is creeping up but I forget the number. His albumin is normal but last Sept it was not. His potassium is high so they are decreasing his Enalapril. He had an ACTH stim test last year to rule out Addisons as a cause for the increased K+. He is on kidney diet .. right now K/D...he was on NF. I give him whatever he wants to eat, but do try to keep him on the RX foods.
He is on aluminum hydroxide as a phosphorous binder.
The only thing you might want to ask your vet about is the possibility of leptospirosis. When my Olivia was diagnosed years ago (2012) with PLN, she was tested for lepto. I will put her link below.... She just passed away recently so they DO sometimes turn around!
Here is a link about lepto and renal failure:
https://www.merckvetmanual.com/gener...irosis-in-dogs
Links about Olivia..she had multiple issues. In the end it was the renal disease that got her....but, she did hang in for a very long time.
http://www.yorkietalk.com/forums/sic...phropathy.html http://www.yorkietalk.com/forums/sic...ick-again.html http://www.yorkietalk.com/forums/sic...ed-issues.html