You lie and say you have no money.
"Aww, that's too bad. Lurg?"
The mangy mouse suddenly lunges forward and restrains you. He's stronger than he looks.
"We can find other uses for you. I think it's time you met our boss."
The chinchilla slips down a shadowed alleyway and the mouse drags you along behind. After a little while, you're dragged down a set of stairs. You feel a new bruise form each time you hit a step.
Eventually, you find yourself being dragged through tight tunnels and you hear the drip, drip, drip of water. The pair have dragged you all the way down into the sewers.