Yeah, it's too bad there isn't as much variety in sizes of pet cats as there is with dogs. A great dane or bull mastiff can exceed 150 lbs. A cat doesn't get much bigger than 15-20 pounds.
But then if a cat weighed 150 pounds, it'd be a mountain lion. Or a leopard.
He was convinced turning them into housecats was only a matter of adopting them young enough and raising them with an iron hand. He found however that despite his efforts they would not stop to piss in his house and would not stop to kill the neighbourhoods housecats, so the experiment failed.