My girlfriend has a service dog, but I don't want to have to bring it along when we go on our honeymoon.
Doesn't she need the dog? Why wouldn't you bring your fiancee's service dog?
I just don't feel comfortable around the dog.
Your gf needs her service dog to function and not including the dog in on your honeymoon would cause a great strain on your gf. Get to know the dog better so that you can bring it along everywhere you go.
It's not my responsibility to learn to like this dog. It's her dog, not mine.
It is her dog, but you are marrying her, and you need to learn to accept that her service dog will be with her at all times. Without her service dog, she will struggle and feel uncomfortable. You need to be considerate to your girlfriend and understand that she needs her service dog.