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I know which thread he talks about, but I can't find it at the moment. PES answered in that one as well.
It was one of the "What is the minimum age?" annoying threads and I stated the knowledge which breeders / kennel owners use:
12 months of minimum age are very important. The bones grow still, harden longer. First heat is never suggested to even think about anything in regards of breeding a dog. Second heat many, many backyard breeders (those private ones..) use, while still quite young. Third heat or alternatively after 18 - 24 months they're mostly grown out and are able to lower the risk in regards of offspring care as well (I didn't write the only-breeder relevant aspects in that thread but gave some timelines).
As it was just "What's the minimum age", it went around "12 months" or second heat, whichever is the latter one. There never was any interest in "female puppies" or comparable - not even interest in any dog at the whole forum in a personal (real life) relevance. ?
Unfortunately I can't find this thread. Got it deleted? PES stated the varying age in terms of the male dog (due to size differences) after my posting, as well, as such I assumed it would not get deleted. Maybe because it could've been in the wrong category, not sure.