Purina Pro Plan Veterinary Diet CN Critical Nutrition is a prescription wet food sold as 48 x 156g cans and formulated for adult dogs and cats during times of critical care or recovery. It's designed to be used under veterinary supervision for animals requiring concentrated, highly digestible nutrition during recovery from illness, surgery or injury.

The formula is built around high fat content for energy density — critical for animals who need calories in small volumes — and quality protein to provide the essential amino acids needed for tissue repair during recovery. Critical care nutrition is fundamentally different from standard maintenance feeding because recovering animals often can't eat large volumes, so every mouthful needs to count. The wet format is practical for hand-feeding, syringe feeding or mixing with water for very weak patients, making it versatile in clinical and home-care settings.

Recovery from serious illness often hinges on whether an animal can be kept eating. Vets commonly prescribe critical care diets for animals coming out of surgery, dealing with serious illness or recovering from long hospital stays, and the dual dog-and-cat formulation makes this particularly useful in mixed households.