It is a real advert, although Ford never planned for it be used on TV/cinema etc. their plan was for it to gain noriety by being spread around the internet (as it has been here) and offer more publicity that way.
Sort of trying to emulate the success of the Paris Hilton and Kylie e-mails that were sent before (personally the kind of p**sy I like does not have four legs, but at least Ford have tried !! :-D :-D ).
Also, Red was right, no cats were injured in the production, although real cats were used in parts of the film.
