Your dog's gut is doing a lot more than you think. While you're watching them play, sleep, or greet you at the door, their digestive system is quietly running the show. It's not just breaking down food. It's sending signals to the brain, training the immune system, and setting the tone for how energetic or anxious your dog feels on any given day. A dog with a balanced gut tends to bounce through life with more energy and steadier moods. A dog whose gut is struggling? The signs show up everywhere, from their behaviour to their coat to how often they get sick.