http://www.youtube.com/watch?v=FAox2OrJ_3I
In the 20-second video, our black feline friend can be seen from behind, sticking its head out of a window and making said barking noises (some have suggested the mimic is to scare off an actual canine, but we're not sure).

When it realises its owner is behind it, camera in hand, however, the cat immediately switches to making more, err, cat-like noises.
Read more: http://www.metro.co.uk/weird/868063-...#ixzz1R95V1DLb