What kind of allergies?

Digi is allergic to all meats except Fowl & Fish.. I feed her Origen 6 fish... They also have Origen Chicken (I think thats what its called)... as there is no garbage, no chemicals, no mystery meat, & no mystery parts!

Now if the dog is allergic to things like dust & grass, wouldn't it just be cheaper to buy him/her allergy meds? <- Others need to step in here as I haven't researched this yet