I would suggest that you do a search on the forum for neutering but this is a good thread to get you started
Best age to spay or neuter?
At the present time, my male is intact and I wont neuter any more male dogs unless there is a health reason. HOWEVER, my yard has a double fence, he is not left outside if I leave the house, and he is trained.
Living in the country means you have coyotes (probably) and they have been known to let a female in heat go "lure" out other dogs for the pack to kill (we the eastern coyotes are not so much like their solitary cousins out west).