A middle-school boy and his dog, relaxing together after settling a friendly sofa showdown. He's been raised with dogs from day one, and the dog by his side is the family's second dog. And to him, having a four-pawed brother feels just as natural as having a human one. (Ai Tsujimura via SWNS)

By Stephen Beech

Family dogs boost teenagers' mental health - by changing microbes that live in their bodies, according to a new study.

Researchers found that pet pooches prompt changes in the microbiome, the collection of all microorganisms - including bacteria, fungi and viruses - that inhabit the human body.

Previous studies have shown that the community of microbes play a crucial role in health, immunity and digestion.

The composition of a person's microbiome is unique and can change based o

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