
I had a Flattie pup to keep calm for 12 weeks post knee op.........so I can fully empathise. I tried to keep him occupied by giving him trips in the car, taking him into the garden to watch the world go by, all in his cage. Massaging his head and back seemed to calm him but it was very difficult especially with him trying to play with the others at the slightest opportunity.
Walks on lead turned into pulling matches and I couldn't be too rough on him as I didn't want to risk twisting his leg.
Time passes though and you will get through it.