My cat just dropped a tick

[Woodi]

on an upholstered livingroom chair. My husband picked it up to show me: it looks like a blue grape, it's that engorged. But a grape with a tiny head and tiny legs, which is moving along, pulling its engorged body with it.

YUCK!

Hubby was about to flush it down the toilet, when I checked online, and it says quite clearly: DO N