Yesterday

Yesterday I was down at the kiosk,
A customer came up and points at meat,
my older coworker said,
"yes that's our 100% beef dog,
    there's no filler in that"

I stood there for a few seconds thinking about
           it.
Did the customer think that there may have been "filler"?
            who knows.
What is this "filler"? Maybe I am no expert on sausage

I hate working at a place like that