Dehydration is one of the oldest methods of preserving food. Dehydrated dog and cat food is generally processed at low heat for a long time to draw out or evaporate any moisture out of the food. Each of the dehydrated food companies that we carry use different methods and temperatures to achieve this. I outline this below. In my research there definitely seems to be more variation and uniqueness in the processes used to dehydrate than to freeze- dry pet foods.
Foods dehydrated at higher temperatures are not considered completely raw, but very lightly cooked as the moisture is removed. Cooking denatures many of these nutrients including delicate enzymes, vitamins, minerals and amino acids, affecting the nutrition of the product.
Dehydrated dog food is usually harder than freeze-dried food and takes longer to rehydrate.