In addition to veterinarians asking dog owners what type of food and treats their dogs consume to help evaluate the dog’s health, almost all certified dog trainers ask this, as well. But, why would a dog trainer care what your dog eats? It’s because nutrition affects a dog’s behavior. Poor nutrition can contribute to a number of behavioral issues in dogs.

For instance, food that provides excess sugar and unhealthy chemicals, can cause dogs who are already aggressive, anxious, hyper, or fearful, to be even more so.