He has chronic wound issues on his hocks. It's similar to Human diabetics and the skin wounds and issues they have. I guess diabetes affects the skin integrity and blood flow. Leroy's had surgery last year on his left hock which resolved that issue. Then his right hock started with the same issue even though Leroy wears his snazzy boots and it got infected and then the bone was exposed so he had surgery to fix that.
I've searched FDMB as far back as the current version goes (2014) but didn't find anyone who had a similar chronic wound issue with their diabetic. Maybe Leroy is the only one
I warmed the fluids last night. I erred on the side out caution and used barely lukewarm water for a couple minutes. Slightly warm is better than too warm. I'm not sure if it made a difference but Leroy didn't move around too much after he ate his snack.