@JessiHart,
Hi Jessi. Sorry to hear of Max's problems, but glad to read that he has been cared for.
I wish that I could be of help to you, but it seems now that all you can do is wait until Max gets better.
Saddly, I am on a death watch for my male Kuvasz, Abba, whose hind legs have begun to fail, and at 2:00 am this morning had to be raised to standing via a pet sling with both my wife and I after he spent several minutes crawling through the snow to get to my back door after failing to rise on his back legs. It was heartbreaking to see my buddy endure such, and while he has risen today with limited difficulty, he is living on borrowed time now.
Hug your pet while you can. Soon it will be too late.