I've been feeding my 5yr old female on raw for while with good results. Most of my blend is made up of chicken, i'd say 70% of it. I notice she licks at her feet alot and I'm thinking she may have a chicken allergy. So I want to switch to more of a beef diet but beef is very pricey. I am able to get beef heart for a much better price. Would feeding a diet made up of 70% heart be to much for her?