Nah, don't blame the dog, blame the officer. He is trained and responsible for handling that animal and maintaining its training.
These animals are hand-picked and raised by specialists often with a lifetime's worth of experience. It's a shame to see them go to waste.
It's more complicated than that. Short term evolution can have dramatic effects.
Among sparrow around newly installed highways, it's found they have on average a 30% shorter wingspan, why? Within 7 generations, they adapt to maneuver better around cars because the ones that
Tell ya what, seeing as how you Europeans know so much better than we Americans do, instead of imprisoning our violent criminals, we'll just ship em over to you because you're so much better at handling them.
It actually involves an evolutionary repulsion against disease.
Whether it be a display of moderate to severe mental illness to STDs and their symptom manifestations (like pustules and worts), the disgust response is the same reflex a cross the board.
She should be removed from the plane for buying a ticket she isn't eligible to actually use. She very clearly violated a policy by not purchasing two tickets.