Who is the stupid bully who did this, I wish we had video.
You are assuming that the dog owner is telling the truth. Sounds to me like the mother didn't mention there was a dog in the bag (BECAUSE she didn't want to pay to put it in cargo) and after she found it dead, decided to avoid any responsibility (and the anger of her child) by blaming the hostess.
Well, after reading the rest of the posts, I must say I seem to be wrong.
Are the overhead bins airtight ? If the dog barked for 2 hours, maybe he barked himself to death.
Yeah, because there seems to be a lot of conflict in the 'stories' about this incident.