If Holly is doing something she shouldn't we say a firm no and turn away from her, after a couple of times she knows that what she may be doing does not get her attention and she stops doing it. I can now say "No Holly, thats not for you" (shes likes to chew peoples clothes!) in a normal voice and she stops instantly, she knows that the word No leads to her being ignored until the behaviour stops.

I love Holly's little growl, She mainly does it when playing but she will also do a cross bewtween a growl and a grumble when she wants a cuddle on your lap