I know German breeds are often labelled as cat killers, more than any other breed. It can and does happen. Dogs raised from a puppy in a home with cats makes a big difference. I think an issue that is more important is to raise kittens with dogs in the home. A small furry critter with jerky scared movements can trigger a prey response from any dog. A cat that is raised with dogs just doesn't give a fly poop.
I have noticed many times, my 10yr old male GSP and 5 yr old male cat happily curl up together and groom each other. I had a Wirehaired Pointing Griffon and she was the same way.