I don't know if this will help or not, but several years ago I realized something that has since helped me a great deal in fearful situations. I used to be afraid to fly ~ not so much during the flight, but was absolutely terrified during take-off and landing. I wasn't so much afraid of a crash as the loss of the life I have with my husband, or worse, losing him or him being injured. Absolutely terrified.
On one flight, the fear, tears, etc., started to well up inside me and somehow, I realized (or was told, depending on your beliefs), that there were only two possible outcomes: either the plane
would indeed go down, or it would not. The better result was far more likely, but IF the bad thing happened, then in that moment, I would instantly be able to access all the fear, etc - it would be there ( I wouldn't have to go looking for it
) at the right time. Other than a prayer before we took off, I would have absolutely no control over what might happen. Of course, just as you have chosen a good vet, taken good care that your pup is healthy, etc., we had chosen a reputable airline,etc. If nothing bad happened, then I was putting myself through misery and pain with my unnecessary terror. I was actually LOOSING precious time that I could have enjoyed holding my husband's hand, flipping though Skymall, happily planning for and anticipating the next day . . .
If the bad thing happened, all the fear and pain would come to me then. I didn't need to feel it NOW, when nothing bad had happened.
This sounds so overly simplistic as I type . . . I think I'm going to pull this off the message board and send it as a PM instead. I can't explain how or why it helps ~~ but I can assure you that it HAS helped me in many different personal situations, not just on an airplane. I hope it helps you as well.