I'm hoping to get some good info from this thread. I have the same thing with Mickey. He'll try so much harder if he knows there's a treat, especially one of his faves. Having learned the hard way with horses (who are no way as smart as a chi) I do treat intermittently, but he still sometimes stubbornly looks at me like "Show me the treats". It's especially a problem with recall.
He prayeth best, who loveth best, all creatures great and small.