Hello and welcome Tracy and Woody.

It sounds like your vet has things well in hand and is on his way to ruling in and out, what could be the issue.
Leslie covered the pertinent about maybe DI if everything comes back negative. Either way, Woody can be treated and live out a good long life.
I'm so glad that you and Woody found each other. A pair made for each other. Poor little guy, feeling so awful that he had an accident. My golden was horrified when she had an accident in the house. It just never happened and wasn't her fault, but hard to tell that to a dog.
I'm glad you found us and you'll have a place to ask any question, have a constant support group, whatever you need.
We'll be looking forward to seeing those test numbers. They help so much in trying to figure out what can be going on.

Welcome again,
Sharlene and Molly Muffin