Probiotics for Dogs as a Dietary Supplement Probiotics are the good bacteria that colonize our intestines and rebalance our microbiome. The microbiome is an ecosystem of good bacteria. It functions like a rainforest. The species live in interdependence with each other. When one species disappears, the entire ecosystem becomes unbalanced. In relation to our modern lifestyles, good bacteria are disappearing from our environments, leading to various health problems: repeated infections, poor digestion, allergies... Our probiotic dietary supplements give a good boost to restore this harmony.