Our Aussie gets on 'running jags' upstairs between our room and our son's . . . she goes at top speed even though it's only about 25 feet inbetween then turns on a dime and goes top speed back to the other bedroom always with a crazed look on her face -- she'll go back and forth 10, 15, 20 times until we tell her to stop. She also attacks the upright vacuum cleaner; she'll watch me vacuum and if I get too close to her, she growls and grabs the rubber bumper on the front of it, sometimes lifting the front end and I end up in a tug of war with her over it
. I have to keep saying "No, Mattie" if I don't want her doing that, but she gives ground very reluctantly!
Also, God forbid I say anything to the cat or say his name . . . she goes into full herding mode. She'll either make sure her body is in between the cat and me at all times so that I won't be able to pet him or pick him up or she'll simply chase him out of the room. She's very lucky that 1) he's an extremely laid back cat and 2) he has no front claws -- he will whack her in the face if she bothers him enough!
He's never hissed at her or put up his back fur so he's not actually mad at the dog.
Pets are great entertainment, aren't they? 
Not for us, our almost adult pup drives us nuts. We never know when she will go OFF.
Last night was a wowee- , we went to bed and the old fart dogs settled in for the night. Both Coon Cats took their place on the head board and we all snuggled down for a winter nap.
We had been asleep for a good 3 hours when the Pup for some reason decided to cause mayham.
Now to put this into prospective, I sleep with the bedroom door closed and the window cracked all winter long.
The 2 old and barely breathning dogs were curled up under the blanket with me, the Cats as I said were asleep on the head board when the Pup went nuts.
The Pup tried to dig the old timers out from under the blankets and went for the cat sleeping over Hubbys head.
I awoke to hubby cussing like a sailor with blood running down his head. the pup had gone for the cat, the cat jumped down with all four paws in claw mode and liked to have scalped Hubby.
This Pup is of controll, so for Xmas I want Hubby to inroll the Pup into obedience training. This is a Brussels Griffon a terrior---you know that Terriors are very stubbon and this may be a problem to train a hard headed free spirit---Like Thor to do anything.
Sorry Thor I could not resist that ping.