As a general rule Dogs are rather stoic..adaptable...and tolerate their situation (albeit less than desirable in human eyes). My experience showed them to just "switch off" during flight and they mostly ignored any other activity on the cargo deck. While there is no guarantee that people do not try to fuss them or try to stimulate play or activity during transportation these same events can happen when out walking your mutt and a stranger wants to call your dog and fuss over it ....Aaaaargh !! BACK OFF !!
If the dog shows temperamental and/or behavioural issues after the transportation period then the likelihood is that the pooch had them before shipping.