When time, energy(motivation) is available, I do not feed veggies or grains. They meet no known nutritional requirements for the canine carnivore and burden their pancreas. This, unlike the omnivores and herbivores that have different enzymes in their saliva, the correct bacteria, and length of digestive tract that is appropriate for veggie and grain digestion. Wolves never intentionally eat the stomach contents of their prey. I know of a 120 pound timber wolf that was fed only one whole processed chicken daily for 12 years. He was vet tranquilized annually for a complete workup and never required any supplement.