Heat damages nutrients and taste. You might be aware that steaming vegetables is much healthier for us than boiling them. By cooking food at a lower temperature for shorter periods of time, it preserves more nutrients and vitamins. When meat, fish and other proteins are heated to high temperatures it changes the structure of the protein, making it less nutritious for your dog and also harder for them to digest.
In much the same way, cold pressed dog food is also produced at lower temperatures than the traditional methods of making dry dog food, known as extrusion, and therefore preserves more of the nutrients, producing a more nutritious diet for your dog.