Signature Grainzero Adult All Breed Mackerel Cat Dry Food is a complete and balanced grain-free dry cat food for adult cats of all breeds. Made with real mackerel as the primary protein, this premium formula features 48% real meat inclusion — Grain, Gluten and GMO free with No Corn, Wheat or Soya. Rich mackerel protein naturally high in omega fatty acids supports lean muscle maintenance, healthy skin and a gleaming coat. Natural fibre supports smoother digestion and helps minimise hairball occurrence.