I agree with traunero, Greg. Walk the dogs
Last flight we did, 5 more minutes would've saved us a "poopy" clean up. I'm now allowing an hour for transfer from ground transport to my airplane. Time for "walking", pictures, paperwork, loading, etc.
Airport parking lots, off ramp areas work for walking. Be CAREFUL at towered, TSA-airline airports where you walk on the ramp!
WalMart shopping bags serve well for "Picking Up" the dooty. Or, WalMart sells special purpose bags in the pet section.