What is the difference between Prescription Diet and Science Plan brand pet foods?

Prescription Diet brand pet foods are formulated to address specific medical conditions that can develop in pets. Science Plan brand pet foods are formulated to meet the needs of healthy pets during various life stages. Prescription Diet foods are available through your pet's veterinarian, while Science Plan foods are available through your veterinarian and at pet specialty stores, feed stores and some pet grooming facilities. We do not make Science Plan products that serve as substitutions for Prescription Diet products.