Do you grab a big bag of pet food from your local supermarket without looking at the label? Or are you overwhelmed by the seemingly countless number of ingredients you can’t even begin to pronounce or recognize?

Picking the best food for your dog can be a challenge. Some subtle—and not so subtle— ingredients in your dog’s food could be depriving him of proper nutrition or even be making him sick. We talked to holistic veterinarian Dr. Patrick Mahaney to break down the hidden dangers lurking in pet food and lay out some simple steps to improve your furry friend’s diet.