I run a dog rescue. Every dog that comes in is fixed immediately. There are way too many unwanted dogs in the world, and most of them are caused by carelessness. Spaying and neutering also cuts down on cancers in dogs. Get him fixed ASAP. In most areas, there are low cost spay/neuter clinics. If you go to Petfinder, you might be able to find one in your area- or call your local shelter.