Hi Wendy and Jody, welcome. I'm sorry you had to join our club but so glad you found us. Good job doing your research and asking the vet about pain management . Codeine is sometimes used so I wouldn't worry too much at this point as long as other pain medications are provided. As you've seen here, Gabapentin is the most common since it works on nerve pathways. Jody may also come home with a 3-day drug that was injected at the end of surgery ("Nocita"). Ask your vet to make sure. 

She's a beauuuutiful doggie, I love the avatar photo. Please holler and ask whatever questions are on your mind. We hope to take your worries away! Your future posts won't need to wait for approval.