The study links this decline to environmental contaminants.
The study included five breeds of dogs, with about 42 - 97 dogs studied every year for total of 26 years.
Negative effects of our environment on health is not really surprising.
The question that does remain is how deep this rabbit hole is and what else we have to look forward to in the future.
Source article:
Study demonstrates rapid decline in male dog fertility, with potential link to environmental contaminants
Further reading:
Study demonstrates rapid decline in male dog fertility, with potential link to environmental contaminants