OMG Grey..I am SO so sorry for your huge loss . The vet should feel every bit of guilt... It was NOT your fault...you did every bit of prep necessary and we just don't know when a dog's systems will react so poorly to it. I am sure you are devastated at the loss of your Boston. I'm a fellow dog mom and I can feel that pain. I SO wish I could take it away. I feel horrible that happened to your baby.