Your dog should not have the opportunity to chase. It's self rewarding. Leash the dog and keep it with you. Treat it for looking at the cat and then focusing on you. I would set up baby gates so the dog can't just run through the house. You need to be proactive about it. My pup has always been overly interested in the cat and I constantly tell him to leave her alone. He doesn't chase because I don't let him even get started. The cat is a huge contributor in all this as she is only 3 and runs and darts around. She will also come up to the dog and rub on him, but then get mad if his sniffing continues too long.
I would work on getting the dog ignoring and focusing on you, not the cat. They don't need to really interact. I would let the cat decide that.
Xan Varik von Fernheim (born 4/3/13)