I took Bo in last month to be neutered and have two teeth pulled. He was still groggy when I picked him up, and he looked at me as if to say, "I don't know what I did, but I promise I won't ever do it again!"
He didn't even have enough muscle tone to get his ears to the top of his head and he was so whiney. I felt terrible, in spite of knowing that the surgery was what was best for him. I took him home and cuddled him all night. Next morning he was fine. I was amazed at how quick he bounced back and I do mean bounced.
Your little ones will surprise you, too!