Treat time, yes?
After surgery, you have to shower your pets in love and attention to let them know that you’re on their side. They might resent you for taking them to the bad man with the knife in the beginning, but over time, they’ll know that you only had good intentions. This is especially true if you give them treats for being such a brave boy or girl.
After having butt surgery, this cat learned that whenever it presented its hindquarters to its owners, it would receive treats. This became a regular thing, and long after the cat had fully recovered, it would expect food for lifting its tail and showing them a pretty smelly sight.