The place I buy critter food was told that dogs that react to beef don't react to bison. Now, I'm not doubting the guy at the store- I believe that's what he was told. What I'm doubting is the accuracy of what he was told. In my head it's not the same thing as the difference between chicken and duck because you can breed a bison/buffalo to a cow (the result is a "beefalo";). Generaly speaking, is it true that a beef sensitive dog can have bison (i realize it won't be true for every dog that is beef sensitive)?