You haven't traveled with me, then. Twice I have been sittting in 1B at the front of the F cabin and a passenger with a large (and I mean large) emotional support dog has arrived and sat down in 1F across the aisle, but with the dog lying on his feet and the feet of the person sitting in 1E (what a saint!) and breathing out halitosis, expelling bodily fumes and spreading allergen dander every time it got up to shake itself.

When I'm in paid F, I don't expect to be inconvenienced in this way, and certainly not have to deal with it on a flight lasting several hours. Nuts I am fine with, but not dogs. On both occasions I have had the person re-seated before the flight took off, but the way of doing that is not to confront the person but to speak quietly and calmly to a FA.