She's just being chatty. When I first see her every day she runs to the kennel door and makes those sounds. Today she does seen a little hoarse. But I was running they dryer, so Mayberry her throat was drying from the dust.
I'm like you, in that I do not tolerate a growling dog. Sometimes they would try to squabble over food and I would jump in between them and stand kind of crouched and they'd each back off. They knew I was the HBIC.
Of course it's way less complicated with one. I'm still talking to DH about that lab, though.