Many dogs - probably most - should not be bred. If you're thinking of breeding your dog, check with other breeders. They'll tell you the chances your dog has or producing salable pups. Remember, if you do choose to breed your dog, you have an obligation to see the puppies placed in homes where they will receive the proper attention, training and care for their well-being (which may include taking the dog back if an owner is unable to continue with its care). 

For those who do not plan to breed or show their dogs, it is best to have the animal neutered. If you choose not to neuter your dog, you have a responsibility to avoid unplanned litters. Dogs mature early. Generally, bitches come in season for the first time at six months, but some breeds can do this as early as four months. Every bitch must be closely observed when due in season and carefully confined through out her entire season.