No animals, pets or other, should be traveling in the cabin. I once flew near a woman with her pet dog and all of us passengers around her had to complain about the fleas to the airplane staff. They finally moved her flea ridden dog to another area of the plane but not before some of us had been flea bitten. Why do we even have to have this discussion. Humans in the cabin - animals in the hold. Private companies can regulate themselves based on supply and demand.