I’d also be thinking about your ongoing relationship with your DIL, and son for that matter if the issue is brought up again. Some of us, me included, absolutely love dogs. Others don’t. Respecting those who don’t means that we need to be sensitive about the choices we make, I’d never take my dog to visit anyone who actively, and for whatever reason, doesn’t like them. They also have a choice whether to come to my house which is the dog’s home, although I’d be happy to keep him in a separate room for a while. Once you’ve shown that you empathise with her, you stand a far better chance of a good, mutually understanding relationship. Something along the lines of “I really love to include my dog in everything, but I understand and I’m willing to compromise, if he/she makes you feel uncomfortable “.
Good preparation now could make all the difference in the future, especially if the pattern of little human feet might come along!
Wishing you all the best at the wedding ?