Even indoor kitties that have never set foot in the outside world can pick up fleas and other parasites. You go outside don't you? Not everything you bring back in is groceries... we bought a bathmat from a very well known store where they don't waste money on extra packaging, brought it back, and laid it out in the nice warm bathroom.

The following day whilst on the loo, I sat there astonished as this brand new rug suddenly started literally jumping with fleas. Flea eggs can sit unhatched for weeks, then there is a trigger (usually warmth and vibration) that gets them hatching and lo and behold - fleas.

LTS