Do you feed your dog once a day? I've been feeding my Norwich terrier twice a day because he'd always been fed that way (got him at age 6), just noticed in the official Norwich book they say once a day should be fine.
That brings up another question - do you leave food out, or take the bowl away in a few minutes? That's not an issue with my Norwich, he empties that bowl in 30 seconds or less each time. I've often wondered what he'd do with if a 25 lb bag of food got dumped on the floor. I suspect he'd be face down in it until he exploded...