I've read many times that some breeds are prone to different things, and therefore require different dog foods. For instance, German shepherds aren't supposed to do well on a rice, fish, or soy diet. They also need more fibre because their colon is shaped different than other breeds.

I don't think that it's nessecary to have different brands of dog food for different breeds though.

And Ash is right, they just substiute a different name each time. Atleast they seem to know what they are talking about lol. All breeds deserve food as good as that.