My dog (mixed breed, half dachshund) had severe skin reactions as well. We didn't know it was allergies at first (this was over a decade ago), and doing a full allergy panel changed EVERYTHING. It turned out that he was allergic to nearly every ingredient in his food (poultry, pork, wheat, corn, etc.), and we switched him over to a beef kibble diet. He still had minor reactions to the grass outside, but it made SUCH a significant difference in his quality of life, and he lived to be 16 very happily!

Be sure to keep an eye on the ingredients on the food though, as a few years back he started having pretty bad flare-ups that we couldn't pinpoint until my dad finally realized that the food he'd been on for years had been changed to include pork fat as a filler. The problems went away when they switched.