I try to have a routine for 'going' like; lighting a candle, running a bit of tap water, and then I go to some other place in my mind. Sometimes, blowing my nose while sitting on the throne helps. This takes my mind off what I am there to do . Now, this is at my house! So, I am up 'Shitless Creek' if I have to go in public. I would hold it until my bowels burst.
BTW, my dog has this too. I imagine our pets are a mirror to our personality, seriously.
Check my FB link to a page I dedicated for this.http://www.facebook.com/edittopic.php?uid=114758165231953&action=8#!/group.php?gid=114758165231953
When it comes to using the potty, Dorothy said it best, "There's no place like home."