This study aimed to develop fecal low-odor adult dog feed using processed corn protein powder as the primary raw material and evaluate its effectiveness through feeding experiments. The objectives included analyzing the fundamental nutritional indicators, comparing the quality of fecal low-odor adult dog feed with commercially available dog feed, and assessing the changes in the eating behavior, physical condition, and physiological and biochemical indicators before and after feeding on the fecal low-odor adult dog feed. This study involved formulating dog feed using processed fermented corn protein powder and conducting nutritional analyses to compare moisture, crude protein, ash, crude fat, and starch contents. Physical properties such as hardness and cohesion were also evaluated. Feeding experiments were conducted with adult dogs to monitor the changes in the eating behavior and physical condition. Physiological and biochemical indicators, including ammoniacal nitrogen and putrefactive odor in feces, were measured both before and after feeding to assess the impact of the fecal low-odor adult dog feed. The analysis showed no significant difference in moisture (p > 0.05), crude protein (p > 0.05), ash (p > 0.05), crude fat (p > 0.05), and starch (p > 0.05) contents between the fecal low-odor adult dog feed and commercially available dog feed. Similarly, no significant difference was noted in the hardness (p > 0.05) and cohesion (p > 0.05) between the two types of dog feed. Both types of dog feed contained rich volatile compounds with varying compositions. The commercially available dog feed had a sour odor, whereas the fecal low-odor adult dog feed had a barbecue and resin-like smell. After feeding with the fecal low-odor adult dog feed, the liquid nitrogen content significantly decreased (p < 0.01). Also, the indole content, a major contributor to fecal odor, based on the data, decreased after feeding.