I like how you started your tread. This is a part of their life that is sad, but in a way, a celebration of a life well lived. You might try helping him go ahead and have a bm before he gets up. I did this with clipper his final week. At least he wasn't trying to hold it and struggle to get up. It made him more comfortable too. Both my boys body failed them first. They were all there, heart, mind and spirit when they crossed the bridge. That made it a very hard thing to do. Keep him comfortable, lots of love.