A link has been found to some household chemicals (diethylhexyl phthalate (DEHP) and polychlorinated biphenyl 153 (PCB153)) affecting dogs:
https://www.smithsonianmag.com/smart-news/fertility-problems...
https://www.smithsonianmag.com/smart-news/fertility-problems...
Despite all those chemicals, we have had longer life expectancies, better quality of life, and less suffering.