i have just had Pixie for one week now..and when i first switched my vacuum on i didn't know how she would react..for safety..cos she's so little..i put her in her crate..i could tell she didn't like it but she was very good..i vacuum every other day and always put her in her crate as i'm terrified of stepping on her, i'm sure if she was out of her crate she would probably bark and growl..she was growling at the washing on the line the other night..and at my watering can in the garden because she hadn't seen it there before! she's so funny!