Webbox Liver Sizzlers. At Webbox, we know a thing or two about tasty treats for our furry friends. If you’re looking for the perfect product to give your dog, then look no further as our Liver Sizzlers are a bestseller! Made with 40% fresh meat and liver, these sizzlers will leave your dog’s taste buds tingling. What’s more, they are gluten and wheat free, so are perfect for dogs with sensitive stomachs or even the fussiest of eaters. Our Liver Sizzlers can be used as a snack, reward or as a training aid for your canine. Chomping down on treats can be thirsty work for our furry friends, so ensure that fresh drinking water is provided at all times.