Just one more point. If the dog's blood pressure is very low, then after the sedation the veins can start to collapse. It's then very hard to get the second needle into a vein. However, the dog is so sedated at that point that they are not aware of anything. Even with that potential problem, I would still choose to do the sedation first.
Murphy, Sheltie/Keeshond, 10/31/91-10/3/10
Max, GSD, 6/3/96 - 4/26/08
Kitties: Taz, Chessy, Jacki and Lucy