In a controlled study published in the Journal of Animal Science, Sofia M. Wilson and colleagues investigated the probiotic potential of Bacillus coagulans GBI-30, 6086 (BC30) in healthy adult dogs. Unlike many probiotics, B. coagulans forms resilient spores capable of surviving harsh processing and gastrointestinal conditions, making it an attractive candidate for use in commercial dog foods.
The research used twelve adult Pointer dogs in a replicated 3 × 3 Latin square design. Each dog received either a placebo, a low dose (5 × 10⁸ CFU/day), or a high dose (2.5 × 10⁹ CFU/day) of B. coagulans. After 28 days on an extruded kibble diet, the dogs were abruptly switched to a commercial canned diet to assess how the probiotic influenced digestive stability during sudden dietary transition—a common cause of gastrointestinal upset in dogs.
Before the diet change, nutrient digestibility, food intake, and blood markers showed no differences between treatment groups, indicating that probiotic supplementation was safe and did not interfere with normal metabolism. However, dogs receiving B. coagulans exhibited significantly firmer stools compared to controls, suggesting improved fecal quality. The probiotic also increased the relative abundance of Faecalibacterium, a beneficial bacterium associated with gut health and anti-inflammatory effects.
Although the probiotic did not prevent all microbial shifts following the diet change—such as transient increases in Clostridium and Fusobacterium—its supplementation helped maintain digestive stability and did not negatively affect nutrient absorption. Importantly, no adverse changes in hematology, immune markers, or metabolism were detected, confirming that B. coagulans is well tolerated in dogs.
The study concludes that Bacillus coagulans GBI-30, 6086 may help preserve stool consistency and gut microbial balance during periods of dietary stress, providing an effective and safe addition to canine diets, especially during food transitions.
Source: Wilson, S. M., Kang, Y., Wren, J. F., Millette, M., Kelly, M. R., Vinay, E., Menton, J. F., & Swanson, K. S. (2024). PSIX-16 Effects of Bacillus coagulans GBI-30, 6086 on nutrient digestibility, fecal characteristics and metabolites, immunity, and microbiota of healthy adult dogs subjected to an abrupt diet change. Journal of Animal Science. Published September 1, 2024.
