Then it's time to find a vet that you can say no to...
Most to all know exactly what they are supposed to know. There are just different way so of practicing and each has their own experiences, so they do have an idea about what works and what doesn't. More people are going to post online when something goes wrong instead of when something goes right, so it does look like a lot of dogs react. Actually in practice though, there aren't that many immediate and severe reactions at all. That's not to say these vaccines should be given on the same day, but that's why it doesn't bother most vets to do it.
Ellie's vet and I respect each other because while she is an amazing doctor, I know a little bit too.
We don't argue. We don't always agree. Bottom line is we trust each other to make the best decisions possible for Ellie and it all works out.
Not all vets can handle clients that are always questioning and researching. They don't want to deal with it. Not many vets could tolerate me for long. Find one who can deal with it... Tell them what you are coming in for. They can't vaccinate without your permission. They probably can report you if you don't do rabies in time. Time to find a vet that will let it go a couple extra months if it makes their client feel better.