Our Boxer dog Sten is trained to leave cats, squirrels, rabbits, foxes, etc, unless we tell him to chase them off. He's off the lead most of the time, and we didn't want to risk him running up the drive & across the road.
The lanky bugger is used to walking among the cows, bulls & pigs though (I used to work on a farm), so he's not scared of much, and certainly not cats.