By Dr. James Carter, DVM · Reviewed by the bestcanineprobioticsguide.com Editorial Team · Updated July 2026 Here’s what most “best gut supplement” articles won’t tell you: the evidence for general gut health supplementation in dogs is weak. A 2025 meta-analysis pooling multiple canine probiotic trials found statistically nonsignificant effects on gut health markers (PMC12299376). That…