About 5 years ago, one of our dogs suffered a similar ordeal. We don't think it was anti-freeze that caused it but your situation appears very much the same. The vet diagnosed our dog with renal failure likely caused by ingesting some toxin and gave us notice that he probably wouldn't survive. My wife never gave up and pushed the vet to do whatever he could and keep the IV in him. I'm very familiar with following BUN and creatnine levels. I compiled and plotted the levels for all the tests to illustrate the improvement to the vet. This gave us all hope.
5 years later, "Chase" is doing fine and leads a pretty normal dog's life. He's on a special diet though but all things being equal, were pretty happy he's still around.
If you need any additional information or advice, please PM me.
Good luck to you and your pooch!
