Generally, infertility in male dogs refers to diminished or
absent fertility. It does not imply sterility.
What causes infertility in male dogs?
The causes of infertility in male dogs are divided into two
main groups, congenital infertility and acquired infertility.
Congenital infertility is caused by genetic (chromosomal) abnormalities;
it is present at birth. Affected dogs cannot produce sperm. Acquired
infertility develops during the dog's lifetime. It has several
causes: