Yeah we3beagles is right. There is no hacking sound at all, just breathing really fast in and out through their nose. When I talked to my vet about it, I actually did refer to it as though she sounded like she was hyperventilating.
We give dogs time we can spare, space we can spare and love we can spare. And in return, dogs give us their all. It's the best deal man has ever made. -M. Acklam