Thank you for your messages.
Regarding the urban/rural divide I completely agree. We live in a rural area and majority of families we know have puppies/dogs with their children and have had no issues. I also imagine that the breeders that won't sell to people with children are from urban areas, as we have not experienced anyone even suggesting we shouldn't have a puppy with children.
It's quite worrying that some of you are commenting that your dogs are still destructive/biting at aged 5 - that suggests lack of mental and physical exercise to me.
When we had our previous dog (Springer Spaniel) before having children we never had any behavioural issues and when we had the children it was us that taught the children from when they started moving around the dog. The dog always knew how to behave as she had been trained and socialised. The children were not allowed to pull or do anything inappropriate towards the dog.
In terms of working, to answer some queries, the dog will be trained as a gun dog. I'm not sure why some of you suggest that this would then not be suitable as a family pet? Most of the gun dogs we know are family pets also.
We have plenty of time to exercise the dog, and the majority of our time is spent outdoors anyway. We go on long walks daily as a family and have acres of land for the dog to enjoy. The dog will spend the majority of it's time outside, with it usually only being indoors to sleep (although our old dog often chose to sleep outside).
I personally grew up with dogs/puppies and this period of my life (3 years) has been the longest I have gone without one, this is due to me wanting to wait until my newborn was 'easier' and I didn't have the time to train a puppy properly with a little baby.
I'm not sure why I am even having to justify all of this, all I asked for was the best day to deal with puppy biting with children, as this is the only part of having a dog that I am not experienced in.
Thank you :)