Mike, be careful about changing foods too quickly as it can lead to upset stomach and loose stool. Best to switch diet over a 10-day to 2 week period, adding a little of the new with a bit less of the old, slowly increasing the new food and eliminating the old.
If you're feeding your own concoction, be careful not to overfeed. I'm a firm believer that obesity creates an unhealthy dog (or child for that matter!).
