is a difficult issue. One of mine did suffer in the last few weeks of his life. Not so much incontinence but no bladder control, continual leaking.
Worst thing was he always slept in my bed at night and he couldn't do that as bed just pong. Same jn rest of house so he then lived in the kitchen (tiled floor) and he couldn't understand. Freedom of house, sleeping on bed then suddenly exiled to kitchen.
Tried dog nappies but they didn’t work (he just took them off somehow.