The advice I posted is not just one given by some vets; breeders have been doing this for years with success rates. So whilst you personally may not find it a 'good idea' that does not mean the method does not work. Quite clearly it does for many!
Introducing two grown dogs to each other in this method is not what is advised; but for puppies only.
It is up to the person asking for the advice which method they will employ.
I just have to reply to this
We have an 11 year old Schnauzer and decided to get a puppy so we got Toby, he was bought into the house and placed inside an indoor pen for an hour whilst Heidi, sniffed around the house knowing something was up, we opened the door to the pen and of course Toby started racing around we opened the back door so he could go and relieve himself and of course we were all looking on and keeping close, when they found each other there was the startled look"hey how did you get here" but as a pup does Toby raced around and we just carried on with life.
We had NO problem what so ever and never have done.
If you want a laugh.....Toby sleeps with the cats who are 10,6 and 3, they are all from different litters..
In my opinion its the owners of unsociable animals that need the training after all, like children ...animals will sense fear from us and learn to accept what us humans like and dont like, they sadly can adopt the same attitudes towards things as humans do!