The Dodgers series is in mid- September, a few weeks before the end of the season. You can assume almost every arm that's on the roster and that has been up before will be up for that series. Figure a 12 man bullpen. I'd say, play it by ear. Nice to beat those guys, but no real need to unless you are in a position to pass Houston for 2d best MLB record.
The Dodgers probably have seen Doolittle a lot over the years. Madson and Kintzler might be more of a mystery.