Attack of the Killer Puppy

My dog Rooney is such a fighter. Nine weeks old and he can already whoop both our cats. Keeran, the one without claws, he just runs over; the poor thing doesn’t have a chance and runs away as fast as he can. As for the one with claws, Arlo, well the dog is more cautious with him. He will usual box at him with his front paws while he waits for a good opportunity to move in and take out the cat’s back legs. But sometimes he will just run in fearlessly, taking a clawing in the process as he overpowers the cat. He has so much fun bullying the cats; when they run away he looks so proud of himself. Sure, sometimes he comes away bleeding, but he doesn’t seem to care. You never hear him whine. Not a whimper.
When we first got the dog the cats tried their hardest to put him in his place and everyone figure Rooney would just learn to leave the cats alone and mind his business like our previous dog Winston. But three weeks later Rooney isn’t backing down and the cats are getting scared. He isn’t even as big as them yet. Wait until he is ten times their size, then they will be really terrified. He isn’t actually violent and he doesn’t try to hurt them. He just wants to play. But, like his namesake, he plays rough. Maybe someone needs to give my dog a red card?