Researchers from the University of Bristol discovered that dogs' behaviour is changed by the smell of stress in our sweat and breath ... researchers say they would like to look at the effect ...

Narrator: There are good boys, and then there are very good boys like these dogs here ... affect the composition of odor molecules that we emit through our sweat, breath, and, likely, urine.

On the other hand, the problem of bad breath ... even in the dog's muzzle. “The process of accumulation of tartar in dogs is complicated as it accumulates in the teeth, becomes like a sharp ...