Who has more bacteria a dog or a human?

Dogs generally have more bacteria than humans, primarily due to their diverse environments and habits. The average dog can harbor millions of bacteria in their mouths and on their skin, which can exceed the bacterial load found on a human. While humans have a complex microbiome with trillions of bacteria, the sheer size and variety of bacteria found in dogs often surpass that of humans. However, it's important to note that not all bacteria are harmful; many are beneficial for health.