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The point is I don't know which flight/airline she travelled on, hence the question. I would not knowingly travel on any passenger flight with an animal in the cabin. The animal might easily have some sort of fit at any stage and in the event of an emergency it is quite possible that the owner would be too preoccupied with the animal (which might be calm or not) to properly follow instructions and procedures. I did not see what procedure the animal was put through at security because it was out of my view. While I have occasionally seen poorly disciplined children on flights, I accept that they, like ill behaved adults, are among the accepted paying passengers - at least they can be told the requirements, they understand them and they (once talking) can provide two way communication. The youngest age that one of my sons flew at was just over two months and they flew a lot. They were never any inconvenience to us or other passengers and that is true of the vast majority of children on flights. I simply do not afford animals the same level of tolerance on board aircraft - out in their natural habitat on terra firma is a different matter altogether.