think thats a bit of a generalisation! Ive known 4 well and none of them have been remotely interested in cats, other than keeping out the way of the paw swipe they get from the cat if they walk too closely past. They are fine with hens too, the ones Ive known anyway, despite being excellent natural ratters.
So it depends on the dog. Also depends if cat is there already, if so and you get a pup, cat will tell pup its place on the ladder ! Plus any dog breed in a pack of 4 is more likely to cause mischief than a singleton.