There are long term side effects to spaying and neutering that everyone should be aware of. It is a personal decision and not always an east one. I just feel that overall it is in the best interest of their health to keep a male intact. The following article explains all the pros and cons. For females I feel it is best to get them spayed when they get older, after their first heat.
http://www.naiaonline.org/pdfs/LongT...uterInDogs.pdf
Whether you own a male or a female, you have to take responsibility to assure there will be no accidental breedings.