Yes, indeed they are.
Have personally had a few in the cabin in years past, proper documentation provided of course.
And they don't try to pinch the a-- of the hostie, after having too many adult beverages.
Give these folks with a guide dog a break...they have enough problems already.
Three hundred pound pigs, on the other hand, should stay firmly on the ground.
This goes for the three hundred pound pax as well.