the house bunny (2008)

Pooter.
A playboy bunny hits 27 and is told to leave the mansion, as she's now too old. On her way out she tries to take her pet cat, but the cat literally clings onto a playboy employee, not willing to leave.
Comedy, Brown,

the vampire lovers (1970)

Miacalla. Gustaph.
A female vampire comes to her victims in the form of a cat.
A servant then tries to convince another victim that the family pet Gustaph was the cause. He of course has trouble summoning up the energy to meow, nevermind attack someone!