What you feed your pet is one of the most important decisions you will make in his or her lifetime.  An animal (or human!) is designed to take the nutrients that they need from the food and excrete the rest.  Some of the waste, such as fibre, remains within the gut and is not absorbed by the body.  Other substances such as excess protein and salt are first absorbed into the blood stream and then excreted with the aid of the liver and kidneys.  It is thought that loading the body with unnecessary nutrition shortens the life of the animal by wearing out these organs.  The Hills Science Plan foods that we recommend are ideally tailored to the needs of your pet without loading the body with unnecessary nutrients.  For further information please ask any of the nurses or receptionists who are Hills nutritional advisors.  All Science Plan food is offered with a money back guarantee - if your pet does not eat it, we will buy it back!