At Gentle Hearts Animal Hospital, we know that companies like Hill’s and Royal Canin have years of research and indisputable evidence that their foods contain all the ingredients to keep your pet healthy. We urge you to talk with these companies as they are happy to share their study findings. Grain-free diets became a trend when people started eating less grain. There has never been any reliable evidence or research that shows the benefits of those types of diets. Even in practice, we have only had 1-2 cases where clients really have seen a difference with skin only issues on grain free diets. The thousands of other cases did not make a difference. And yes, we have seen an increase in cardiac patients in the last few years.