I've never had the cats pay any attention to a stuffed animal. Maybe because they've always had various ones around. But Perky, my dog, when we are out walking and happen to go by a yard with a statue in it.. she will stop in her tracks, and start into her deep threatening bark, sometimes her fur even stands on end.. it's SO funny, especially because she doesn't react like that to, say, a REAL dog. But she sees a statue of a Rottweiler puppy today, and she keeps turning back to tell it off until we can't see it anymore, then walks calmly past a yapping terrier tied into a yard. Silly thing.