I was reading the code of ethics on the American Boxer Club and it didn't say anything about the age of male boxer to be use for a stub. I was just wondering if there is a age. I know that all testing can't not be completed until the dogs are at 2 yrs old or older. I was just curious what the age is for a stud dog. I have no interest in breeding. Just curious to why there was an age for bitches but not studs.