Treelover, am I right in understanding that your daughter has now said for you to go to her on Christmas day, with your dogs as usual, and to stay over that night? And she's told your DS and DiL that they are welcome as long as they don't mind the dogs? If that's correct, then I think she's made the right decision. It's what you always do, and I can't imagine any caring daughter (or son) would want to think of one of their parents left to return home alone on Christmas night, when they would normally be staying overnight with family to fully enjoy the Christmas cheer!
I don't think that your son and DiL have a right to expect you, and your daughter & SiL, to change your usual plans, just because it suits them. It means that you wouldn't be able to enjoy Christmas day/night & following morning like you usually do, and that's not right. Just because DiL doesn't like dogs. Buy a cheap baby stair gate, leave the door open, and put them in another room ... that way, they won't be able to scratch the door!
And I disagree that Christmas is all about the children! I, and all the adults in my family, absolutely love Christmas, and we have just as much right to enjoy it as the kiddies in the family! Hope you have an enjoyable Christmas too!