Thanks for your response! Yes, the vet said he is clear of crystals. We had him on a ph balancing food and he is now fully back on his original food. They didn't mention anything else maintenance wise, but we're thinking of getting a second opinion. I'll look into the refractometer I haven't heard of it!
We used to have a camera and he is pretty chill and just finds different places to sleep while we're away. He has never destroyed anything, seems more like a lonely SA, if anything. I like to say he just loves us too much... He only seems clearly agitated if he's in a confined space (crate or pen) when we're gone. We also considered having a dog walker while we're away at work but he was still having accidents for a couple hours alone, which is making us believe it's SA.
Good suggestion about the belly bands as well. Unsure if a dog friend would help at this time because he is still getting comfortable around other dogs in close quarters, but I appreciate the suggestion.
The only thing we can pinpoint that changed at 6 months was he went to the kennel for boarding around that period of time. We thought maybe he got off his potty schedule, but we're not so sure that caused an issue for him or if the struvite began this bad habit? Or if the kennel upset him?
We're really struggling with this and are not sure what approach to take. I think we will plan to see another vet and look into trainers as well. We of course still love our boy and won't give up!