I am looking for suggestions for dog food options for my 7 year old Boston with multiple food allergies. My vet currently has her on Hill's Prescription Diet z/d, but I am hoping for an alternative that doesn't have corn starch as the first ingredient. Based on her allergy tests, she is allergic to: beef, chicken, fish, flax, green beans, lamb, milk, peas, peanuts, pork, rabbit, rice, soybeans, turkey, and wheat grain. NOT allergic to: apples, barley, brewer's yeast, carrots, corn, eggs, oats, sweet potato, white potato. I've looked at numerous vegetarian food options, but keep running into issues with them containing peas, peanuts, or soy. I know this is a long-shot, but in the event that someone here has similar allergy issues, I'd love to hear your food recommendations! Thank you!