Re: Breeding males too early. Not really. Most male dogs start to produce sperm and are physically able to mate when they are around seven months old -- but the sperm are immature, so there are frequently fertility problems. The general rule of thumb is to wait at least until one year. "Prime breeding age' is often identified as 18 mths to four or five years (probably longer for slow maturing giant breeds like Mastiffs). The other drawbacks is that at 11 mos, you don't really know how the dog is going to turn out, and whether he will ultimately be a good representative of the breed. Many genetic and developmental problems do not show up for a couple of years. Also, only preliminary tests can be done on hips -- although I suspect that health testing would have been the last thing on this breeder's mind.