It was me that gave the info regarding persians :D

Emirates & Qatar Airways won't fly any snub nosed breed (persians, boxers, pekingese etc) because of the added risk. These breeds can sometimes have breathing problems associated with the inbreeding that developed their snubbed faces and there have been a couple of cases in the past of flying affecting their breathing.

This rarely happens but rather then get sued for someone's pet dying on a flight, they've decided to just stop flying any of them altogether.

We're trying to peruade them to have a liability waiver that the owner signs so the owners are fully aware of the risk involved and will not claim QA liable if anything should happen.