Yes breeding is harmful. Millions of dogs are euthanized every year due to overbreeding caused by breeders, puppy millers, and people who don't spay and neuter their animals and then allow them to breed as well. There are not enough compassionate people to adopt instead of buy, or some are just ignorant to the homeless animal situation. The figures for the millions euthanized ever year are only the ones recorded in shelters, it doesn't include all the ones that die on the streets from neglect, abuse, starvation, illness, exposure to the weather like freezing to death and dying from heatstrokes, etc.
The best thing you can do for your dog is get him neutered and don't add to the overpopulation crisis.
Also, as far as his own health is concerned, my old neighbors dog died from developing cancer somewhere in his genitals that could've been prevented if he'd been neutered. So yes there are health concerns with keeping them intact.
As long as there are slaughterhouses there will be battlefields. - Leo Tolstoy
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