I've had very sick dogs and have just let them sleep. I make the crate cozy and comfy in the main part of the house. I do everything I can to relax them, grooming with soft brushes lots of love and gentle strokes. The pain meds and general condition make them tired, age makes them tired healing makes them tired. They don't want to do much for the first few weeks as they heal so I them do as they like. Keep on top of their pain relief keep them warm well fed and still. I also sleep in the same area as the dog and watch them throughout the day. Time off work if you can get it too.