There's been some fuss in the Australian media today because Jetstar refused to let a guide dog (seeing-eye dog) onto a flight. Obviously there's regulations in place which allow guide dogs on flights and the airline didn't act accordingly, but this raises a question I'm interested in hearing the answer to...

I've been on flights before where it was announced that nobody could open any nut products on board the flight because someone on board was violently allergic. They informed the airline beforehand as it's common for the airlines to have snacks on board containing nuts.

However what would happen if someone on board was violently allergic to dogs? It's not common to have a guide dog on board, and is not something you would ordinarily see the need to inform an airline about! How would an airline be expected to deal if a guide dog needed boarding and someone on board was violently allergic?

Just curious!