@ehBeth,
Funny I haven't done it yet - I have been debating paying the extra for the blood work. I would have never overthought this before. I asked a friend who has had several pets and goes to a vet in the same town where this particular vet moved from - not her prior vet as she has a family member that works at the expensive one she goes to --- she gets a family discount.
Any way after over thinking this - I think I am going to get the blood work. My friend said sometimes paying out the extra money is worth it for your own comfort. I mean we paid $1k for the little monster - only because my daughter paid half.
I told everyone we get another dog - he is going to be adopted and not a puppy - the first year is so expensive and then all the training. Then if you adopt you also get to brag how you rescued a dog rather than "bought" one.