Webbox Chicken Sushi. The snacks are free from gluten and low in fat so that your dog can nibble on them without putting on the pounds. Made with 91% chicken, your furry friend will be able to sniff them out all the way from the kitchen cupboard. The 40g bag is the ideal size to take in your bag whenever you are out on a walk. With all treats, always be sure there is fresh water available.