We’re all doomed, DOOMED I TELL YOU!
I believe the story is that this cat was raised with other dogs and learned to bark instead of mew or meow-ing.
Also noteworthy: http://www.youtube.com/watch?v=aP3gzee1cps
it has nothing to do with being raised by dogs, its a cats response to excitement related to seeing something it wants to eat, whether it be a bird, bug, or anything else it thinks looks fun to chase and to attempt noms on.
all cats do this, even lions and leopards. next time your watching a doco on said big cats, watch their mouths before they attack a zebra or something, pretty much identical lol.