Since I understand that your dogs are outside dogs, where will the cats be living? If they are totally to be indoor cats I would say to just make sure they stay in and the dogs stay out.

If you want the dogs indoors, I would think a leash is a requirement. You need to be able to control the dog and the cat needs to be able to flee.

If the cats are to be left outside, I fear that they WILL be chased. Some dogs have a high prey drive and it is simply in their genetics to do what they do.