Study showing decline in dog fertility may have human implications

At the heart of the research is not the dog, but the question of male human fertility. Repeated tests over more than 70 years have shown a downward trend in male fertility, but there has always been argument about the consistency and accuracy of the findings……. “Why the dog?” said Dr Lea. “Apart from the fact that it is a great population of animals to work with, dogs live in our homes, they sometimes eat the same food, they are exposed to the same environmental contaminants that we are, so the underlying hypothesis is that the dog is really a type of sentinel for human exposure.”