My 9 yr old mini aussie Jazz suddenly has a very dull/coarse coat. She used to have a nice soft shiny coat and the past few months I've noticed it's become increasingly dull/coarse. I switched her from Innova Evo Low Carb food to Orijen Adult a few months back could that of caused the change? If so, what is another food that may be a better option? Is there anything I can do to improve her coat until I finish this bag of food (I just got a new bag a few weeks ago)?? Thanks!