Since I moved to Arkansas,...

Question
Since I moved to Arkansas, my dog incessently chews her back, near her
tail and pulls her hair out.  She seems to have some sort of chafing build
up in the area she began chewing on.  Someone told me changing her diet
would keep her from this....but don't know what to change it to.  Your
advice?  

Answer
I really doubt that making a move to Arkansas would incite a food allergy.  More likely, she is allergic to something in the environment.  When skin disease affects the rump and back, I tend to think of a flea allergy first.  You should have a vet look at her to see if there is some medical treatment that will give her some relief.