Although I have a nice vet, I 'm still very guarded when we're dealing with my animals health. I don't trust anyone implicitly. Problem is, sometimes I don't even know what questions I should be asking! His is a very small operation so he sends us out for more complicated things, sometimes even for blood tests. This is good and bad.
Years ago, I took my beautiful eleven week old Gordon Setter puppy for his booster shots. Two days later, he was deathly ill. I took him back no less than two times in as many days. The following day, I rushed him to a large University Hospital where he languished for a week before dying. His little body just couldn't take anymore. He had Parvo Virus.
I was incensed! It was April on the East Coast, the very time when this horrible virus is"in bloom". The vet hospital was rather surprised that my family vet had missed it. I was furious AND heartbroken. (Needless to say, they have never seen another of my animals).
Although Toby did have his baby shots and was not in areas shared with strange dogs, I did have an older dog at the time. Even so, there was no excuse for them missing this obvious and fatal disease.
The only positive that came from that experience was that it led me to Rescue and the love at my feet today.
Don't be hard on yourself. You did everything you could.
Your post is important to everyone here. Trust yourself, you know your pet best and TRUST YOUR INSTINCTS. I'm sorry for the price you paid because of them.