The FDA just released a report showing a possible link between grain free diets and heart disease.  We have always recommended Hill's Science Diet or Royal Canin.  If you are concerned about your dog's diet please ask us at your next visit and we can help you find the food that is right for your dog.  For more information on the current understanding of the link between certain dog foods and heart disease:

https://vetnutrition.tufts.edu/2018/06/a-broken-heart-risk-of-heart-disease-in-boutique-or-grain-free-diets-and-exotic-ingredients/

https://www.vetmed.ucdavis.edu/news/uc-davis-investigates-link-between-dog-diets-and-deadly-heart-disease