Hello,
The recommended age is 18 months, though male dogs reach sexual maturity at around 6-12 months of age it is not recommended to breed any male under the age of 1. It is recommended you wait until he is 18 months so he has reached his full maturity emotionally as well as physically. A young stud often causes more injuries for the female and often isn't as successful as a older stud.
Walter
Breeder
Breeder and pet health consultant. Have spent a number of years with dog rescue, training and health