He was probably stressed from the experience.

When Spunky had his cancer surgery and had a tumor removed, I was given the same instructions. He was so happy to be home that he bounced around the first day back home. He didn't come out of anesthesia quick enough so he was there an extra night. He was ready to go home when I retrieved him.

He doesn't jump well or accurately so I just made sure that he could climb wherever he needed to be. He wore himself out the first day and settled into convalescence for the next week or so.

Your kitty will be okay. He was just stretching himself after being cooped up for the surgery.