Hills Science Plan advanced fitness adult dog food medium breed with chicken is ideal for small and medium breed dogs from 1 to 6 years old Hills Canine Adult Advanced Fitness Medium dog food is formulated to support lean muscle and healthy vital organs made in a regular biscuit which is ideal for dogs of medium breeds. Containing high quality proteins to support lean muscle and the balanced sodium and phosphorus levels help to sustain healthy vital organs. Ideal for adult dogs aged 1 to 7 years