Pet food standards cover moisture, protein, crude fat, ash, crude fiber, nitrogen free extract, minerals, trace elements, amino acids, vitamins and other aspects of the content, of which, ash is non-nutritional content, crude fiber has the effect of stimulating gastrointestinal peristalsis. The nutrition design and manufacture of pet food must be guided by pet dietitians specializing in pet nutrition. According to the different growth stages of pets, their own constitution, different seasons and other aspects of comprehensive consideration, according to the nutritional needs, the development of scientific and reasonable pet food standards. In the purchase and use of food for pets, should be based on the pet's own physiological characteristics, growth stage selection, and reasonable collocation and feeding.