Good morning,
Are you American or Canadian? The reason why I ask is because Rover being an American company they go by American holidays which are sometimes different than Canadian holidays so for us Canadians, the holiday schedule is off.
Either way, you can always contact your sitter and ask them if they would readjust the price of those two days. I know that as a sitter, it would be my pleasure to accommodate you on this issue, even more on such a long booking and if those days are not truly holidays. I would simply contact the sitter, I am sure they will gladly fix this for you and it is something that can be done fairly quickly as well. The last thing any of us sitters want, Rover included, is to make you feel like you are being taken advantage of and we will work with you to make sure you are happy and at peace while your dog is in a Rover sitter's care.
Because we have to sit at home so I charge more because I can and I'm worth it.