Weldon
Castaneda
It would be very much considered as a responsible to wait for the dog to reach the maturity level before just allowing the mating to take place. Dog owners can even work according to these approximate guidelines
Large Dog Breeds at about +- 18 to 24 months old
Small Dog Breeds at about +- 12 to 18 months old
Medium Dog Breeds at about +- 15 to 18 months old
Depending on your health and the fertility a dog can even continue to be used as a stud for about ten years. A bitch can even be used for breeding until she is five years old. It is not very much advisable to allow dog mating to just take place once these periods have been reached.
Weigh up all the pros and even cons of the breeding process and then the responsibility of a litter before allowing the mating. If you are going ahead you must just ensure the following is done beforehand.