I swear the first time when I flew on an Airbus 320 I could swear there were puppies that lived permanently in the belly hold. They started to bark as soon as we pushed back on the runway as if they were scared.

So if its scary for people then it must be scary for those poor dogs holding residence down there.

This is what I mean http://www.youtube.com/watch?v=grd5eJjJcL4