Why Your Dog’s Gut Holds the Key to Their Reactive Behaviour

Sam Hughes

Published on: 02/03/2026

90% of dog’s serotonin is produced in their gut, not their brain. If your dog struggles with reactivity, anxiety, or hypervigilance, the root cause might be hidden in their digestive system. Discover how the "gut-brain axis" works, why processed kibble can trigger a "short fuse" on walks, and how simple dietary changes can lead to a calmer, happier pup. Post Description