Beyond the Standard Proteins. When "lamb and rice" isn't enough, it’s time to look toward the wild. The Zignature collection is famous for its use of novel proteins that most dogs have never been exposed to, making them less likely to trigger an immune response. From the lean and nutrient-dense Kangaroo Formula to the Omega-rich Trout & Salmon Meal, these recipes provide essential amino acids and minerals from the world's best sources. At Fetch Natural Pet Market, we recommend these formulas for rotational feeding to keep your dog’s palate excited and their immune system strong.