I think it was probably a combination of things that led to his death. The bite, which punctured his air sac, infection from the bite, he became further stressed from the car ride to the vet, (he became a lot worse in the car), and the injection itself was stressful. I really appreciated that this vet whom I had never been to before was willing to see him, and showed him and us care and concern. Although this vet is an hour from me, I think I'm going to start taking my dogs/cats to her, since this is the third time my usual vet has refused to see a pet of mine or my family in an emergency. I do hope that it wasn't the injection itself that caused my baby to die.