1.) Is your dog purebred?
2.) Did you get your dog from a reputable breeder?
3.) Did you get a 3-5 generation pedigree with your dog?
4.) Are there at LEAST 3 titled dogs in the past 3 generations? (Breed specific work).
5.) Does your dog have a stable temperament?
6.) Does your dog fit the breed standard?
7.) Is your dog healthy and certified (OFA CERF) free of genetic diseases?
8.) Do you have the time and money to whelp litters and afford emergencies?
If you answered NO to any of these questions, spay or neuter your pet.
If you answered YES (to all), you have a dog of breeding quality. However, if you are not active in showing or working your dog, think very carefully about your reason for breeding. Breeding should be done to IMPROVE THE BREED, not "so the kids can see puppies being born", or "because you want puppies from him.her", and NEVER TO MAKE MONEY SELLING PUPPIES.
Don't breed out of greed.