Lurcherlover, I'd think you'll find it is not outdated. After much research both online and talking to trainers, it was one of our most highest concerns about getting a puppy near to the arrival of our ds.
You need to train a dog from day one to know who's boss, otherwise you end up with a dog like our neighbours have. They have a goldenpoo, it barks all day (currently listening to it), they can't even get it n the house!, even dragging it. It totally rules he roost and it's only 9 months old.
There are cerain people who take things a bit too far and not even let the dog in the house, but that was by someone we knew who trained, bred and kept dogs purely for shooting, not as a pet aswell. They used to charge between £10k and £16k for a puppy and people would travel all over the world for them due to their parents and blood line.
If they were trained, anything up to £30k!!
Re the daschund, did it have contact with children from a pup?
And yes we did walk our dog and train the one that turned, but again, due to the fact his history was not known 100%, even though they said he was ok with kids, he actually wasn't with them permanently.
Think we may just have to agree to disagree on this one. It's like anything, if you're burned once, you don't do it again, especially when it comes to your children.