Don't give your pup anything. Anesthesia causes nausea which is one of the reasons we withhold food and water before and after any surgery, the stomach should have very little in it so they don't choke or aspirate if they vomit (for us too). You definitely should not any sort of medication the vet didn't specifically prescribe.
Just follow the instructions your vet gave you when you picked up your pup, they go over when you might be able to start to offer food and water in very small amounts or even from a small ice cube, it may even be on any discharge paperwork you recieved. If you have questions give them a call and ask if there is anything you might be able to do. If you still have concerns after that call them and ask about whatever you have questions about. If your pup is still having problems in the morning or seems off definitely call them. Hope your baby is feeling better soon.
Just follow the instructions your vet gave you when you picked up your pup, they go over when you might be able to start to offer food and water in very small amounts or even from a small ice cube, it may even be on any discharge paperwork you recieved. If you have questions give them a call and ask if there is anything you might be able to do. If you still have concerns after that call them and ask about whatever you have questions about. If your pup is still having problems in the morning or seems off definitely call them. Hope your baby is feeling better soon.