A few years ago, we had a wonderful golden Eurasier dog called Tikva. She took deep care for her younger house mate, B'Elanna, a black Eurasier.
Where Tikva was intelligent, B'Elanna was not. But B'Elanna was very loyal to Tikva.
B'Elanna loved three things:
Whenever she could, she went to Tikva, and said, "Shall we play biting games, eh, eh, eh? That's the best I know."
And often, Tikva would play, just for the sake of B'Elanna, the eternal puppy.
When we got a cat, Frostie, he became involved in the biting games, but Tikva was always careful not to harm him.
She loved cats, too.
Why do we get all the crazy dogs? :D
Sadly, Tikva died. And a few years later, I got Nefnef.
Where Tikva was motherly, Nefnef is not. She sees her teddies as preys, but cats, well, she loves cats.
She wasn't as careful around Frostie though as Tikva was. So the first time I caught them doing pet battle, Nefnef with her jaws around Frostie's head, I yelled at them to stop.
Nefnef learned that the biting-thing around Frostie wasn't okay, and then she observed him. What did he do? Oh, he swung his paws?
Great!
So Nefnef learned to fight with her paws.
Of course, Frostie wins every time, but the little worm often cheats.
He would come at her, ears back, sneaking forward slowly, one paw at a time, and then meowing loudly to call our attention. At first, we would scold Nefnef, until we figured out what he was doing.
I let them fight a little, because they really love it, but once the play gets too rough, I stop them.
Then they both leave our living room and do pet battles in silence in our bed room.
Sneaky pets ;)