Fit and Trim is probably one of the more defunct diets on the market. If you are seriously considering switching to a raw food diet (which would be awesome for him!) please do so very gradually as his system will not be used to such rich foods. A raw food diet is best, but a higher end processed food such as:
Wysong
Solid Gold
Nature's Variety* Innova/Evo
Wellness
Flint River Ranch
are also great foods. Many people are intimidated by a raw food diet or simply can't afford it. Your pets nutrition is the building block foundation of his health-its worth the cost! And consulting a holistic veterinarian will benefit both of you greatly!