Throw them a bone
A raw bone is not only a great treat but can keep your dog busy for hours. Alternatively, get them a different kind of long-duration, natural chewy product that'll distract them from their recovery for just that little bit longer.
Teach them a new trick
There are plenty of low-impact games you can play with a dog who isn't supposed to be indulging in high levels of activity. In fact, it can be a great time to teach your dog a new trick! If they haven't mastered it already, teach your dog to pick up objects on cue ('Take It' is a common command for this action) or to 'Give' you something you want them to let go of. It can take a bit of practice to get right, but what better time to try than when they're house-bound and looking for entertainment?
Pamper your pup
We've all seen the video of that lucky puppy getting a massage. It's not for all dogs, but hey - there's no time like the present! Maybe a massage is just what your recovering pup needs. (Just don't let them get too used to it!)