Gluten is found in grains like wheat, barley and rye, which are popular ingredients in many pet foods because it is a low-cost way to add more protein, says Claudio Salem, the veterinary council at ...

For example, gluten-free dog food became popular around the same time that gluten-free diets (for humans) were all the rage, says Rebecca Greenstein, DVM, a Veterinary Medical Advisor for Rover.