This study evaluates the functional properties of Ganoderma lucidum (Reishi mushroom) as a dietary supplement in canine nutrition The research investigates its impact on gut health, immune modulation, and nutrient digestibility in dogs. Findings indicate that Reishi supplementation may enhance intestinal integrity, support beneficial microbiota balance, and positively influence immune response without adverse effects. The study highlights Ganoderma lucidum as a promising natural additive for improving overall well-being in dogs, especially during periods of stress or dietary transition. These results support its integration into holistic pet care strategies that emphasize preventive health and scientifically backed botanicals.