Your dog’s belly bacteria might be controlling their personality more than you think.

Ever wonder why your usually calm golden retriever suddenly becomes anxious during thunderstorms, or why your rescue pup seems perpetually stressed despite your best efforts? The answer might be hiding in their gut. Scientists are discovering that the trillions of microorganisms living in your dog’s digestive system don’t just help break down kibble—they’re actively communicating with the brain, influencing everything from mood swings to immune responses in ways that would make any dog parent rethink their approach to canine wellness.