Hi M.,
We do a lot of running as our 4 year old has Down syndrome and we got to lots of therapy and doctors. When we trained his sister, she got drug around to everything as well. When they are young it is difficult to hold themselves up on a big potty and I got tired of trying to hold her up which was uncomfortable for her and me.
I found a great traveler potty seat which is cushioned and folds down small enough to fit in your daiper bag and also has a little bag to put it in. It is by Mommy's Helper and called the Cushie Traveler. You should be able to find it at a retail store, but if not, email me at ____@____.com. I have an on-line store under member perks and carry this.
K.