Dog Allergic To Railroad Ties Is There An Inexpensive Way To Feed A Dog That's Allergic To Everything?

Is there an inexpensive way to feed a dog that's allergic to everything? - dog allergic to railroad ties

My dog is allergic to the following: pork, turkey, soy, peanuts, most types of rice, milk, smoke, and snuff, and all varieties of grass, corn, and other than wheat.
It costs a fortune to feed, and the above are only the worst of his 3-page list of allergies! When it comes into contact with an allergen, loss of hair and their skin is broken in leisions bloody. His butterfly was very bad blood and digestive disorders. Currently feed her Purina is delicate, but it is a brand that is not economically not so much?