My mother's generation of women and before her generally gave up work when they started a family enabling people to have pet dogs without the worry of them being left alone. These days in general women return to work after having children meaning that people simply aren't in the family home for periods of time that is suited to a dog's needs.
I know there are options such as dog walking/doggy day care and some people may take their dog to work/work from home etc but assuming that in general people work full time during the week- who are the dog owners of today? Are they mainly retired? Are they families that are lucky enough to have one parent stay at home and intend to forever? Or perhaps one partner works shifts so there is always someone home? I'm just intrigued as it seems our 'nation of dog lovers' will look very different in 20,30 50 years down the line.