Grain Free Adult Dog Food - Tuna with Sweet Potato & BroccoliKibble UK Grain Free Dog Food Why Tuna? Tuna is an excellent source of protein and omega 3 fatty acids together with B vitamins and minerals which contribute to overall health and well being. Why Broccoli? Broccoli is a good source of fibre and contains an array of vitamins and minerals. Minimum 26% Freshly Prepared Tuna: Responsibly sourced and highly digestible protein source. 50% Total Tuna: Rich in amino acids, vitamins & minerals, tuna is a