Oh Greta, I sorry he has to go through so much.
I know how much Luke means to you & I'm glad you aren't worrying too much right now. I think that must be a good sign. Alot of us are as good at "doggy" intuition as Moms do are with their kids. I know I do, I can always tell when somethings wrong.
I bet you are as good of friends with your vet as I am mine!