Grain Free Small Breed Dog Food - Lamb with Sweet Potato & MintKibble UK Grain Free Dog Food Why Lamb? Lamb is a nutrient dense, highly digestible protein source. It is also a good source of vitamin B12 and iron which are required to help keep nerve and blood cells healthy. Why Mint? Mint is thought to help aid digestion and is a good source of iron and vitamins A & C. Minimum 26% Freshly Prepared Lamb: Responsibly sourced and highly digestible protein source. 50% Total Lamb: Rich in amino acids, vitamins &