When making homemade dog treats with kids, it's important to avoid certain ingredients that could be harmful to dogs. Ingredients such as chocolate, raisins, grapes, xylitol (a sweetener), onions, garlic, and certain nuts like macadamia nuts should be avoided as they can be toxic to dogs. Stick to safe and dog-friendly ingredients like oats, pumpkin or sweet potato puree, peanut butter, and whole wheat flour to ensure the treats are both delicious and safe for your furry friend.