The invention relates to the technical field of feeds, in particular to a dietary dog food for recuperating gastrointestinal tracts of dogs and a preparation method thereof, and the dietary dog food comprises a basic nutritional agent, a gastric regurgitation preventing agent, a
magnesium-
zinc absorption promoting agent and a
preservative. The modified
sodium alginate forms gel in the
stomach of the dog,
sodium bicarbonate is decomposed to generate
carbon dioxide gas to push the gel to float upwards to the cardia to form a shielding layer, and the
modified cellulose releases
calcium ions to promote crosslinking of the modified
sodium alginate to form a more compact shielding layer so as to prevent
backflow of contents in the
stomach of the short-
nose dog after the short-
nose dog eats. The active form of
vitamin D3 is combined with a
vitamin D
receptor in intestinal epithelial cells,
gene expression of channels and
ion transporters is up-regulated, and the
absorption effect of dogs on
magnesium and
zinc in a high-
calcium environment is promoted. The fructo-
oligosaccharide enhances the
signal transduction efficiency of the
vitamin D3 by up-regulating the expression level of a vitamin D
receptor, and further enhances the
promotion effect of the vitamin D3 on
magnesium and
zinc absorption.