Thought I might pass this along to everyone. I have a large breed male mastiff, and he would get pretty smelly just a few days after a bath. He lives inside primarily. We are feeding him raw, and my wife commented to our neighbor (a vet) about the smell. She said to feed him a couple of table spoons every day of plain unflavored yogurt with his dinner. In 3 days, his musty smell was completely gone.
Apparently the bacteria in the yogurt helped his digestive track and really made a huge difference.