A method for producing a pet food with good storage stability having a water content of 20 to 45% by weight and a pH of 6.0 or below, which comprises admixing granules having a particle diameter of 300 to 1500 microns and comprising as a main ingredient a fine powder of sorbic acid having a particle size (Tyler's mesh) smaller than 250 mesh with starting materials for the pet food to disperse the sorbic acid powder in the form of discrete fine particles uniformly in said starting materials, and heating these materials simultaneously with, or after, the mixing.