i confess. i did this ONE time, but it was in a public area & not left on private property. we were @ the square & had an appt... lil pug had unexpected issues to tend with while on our way. i couldnt walk the bag to the interior building,-- just wasnt possible. (major ewww! factor) i left little blue bag next to the curb near the trash. on our way out, i collected the bag & disposed of it @ home. i know my pets aren't your problem, but considerate owners will follow the rules & act accordingly. i go out of my way to keep the pets from affecting others--it's common respect.