A study in England showed a rapid decrease in fertility in over 200 dogs of five breeds – Labrador retrievers, golden retrievers, curly coat retrievers, border collies and German shepherds.  Lea, et al also found an increase in cryptorchidism and a decrease in the # of males born.

What does this bode for human males? What are the possible causes?

They looked for chemicals known to decrease fertility in humans and detected seven polychlorinated bisphenol (PCB) congeners, 5 polybrominated diphenyl ether (PBDE) congeners (both are endocrine distruptors) and diethylhexyl phthalate (DEHP). 15 commercial dog foods tested had these same chemicals.

And another study in the US showed over 75% of humans test positive for glyphosate.

This is another reason to avoid processed foods unless you know the owners and they are using safe ingredients, and even then – fresh is definitely best for animals and people.